* [syzbot] BUG: RESTRACK detected leak of resources @ 2021-10-04 10:45 syzbot 2021-10-04 12:42 ` Dmitry Vyukov 0 siblings, 1 reply; 8+ messages in thread From: syzbot @ 2021-10-04 10:45 UTC (permalink / raw) To: linux-kernel, syzkaller-bugs Hello, syzbot found the following issue on: HEAD commit: c7b4d0e56a1d Add linux-next specific files for 20210930 git tree: linux-next console output: https://syzkaller.appspot.com/x/log.txt?x=104be6cb300000 kernel config: https://syzkaller.appspot.com/x/.config?x=c9a1f6685aeb48bd dashboard link: https://syzkaller.appspot.com/bug?extid=3a992c9e4fd9f0e6fd0e compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 Unfortunately, I don't have any reproducer for this issue yet. IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+3a992c9e4fd9f0e6fd0e@syzkaller.appspotmail.com rdma_rxe: rxe-pd pool destroyed with unfree'd elem rdma_rxe: rxe-mr pool destroyed with unfree'd elem restrack: ------------[ cut here ]------------ infiniband syz0: BUG: RESTRACK detected leak of resources restrack: Kernel PD object allocated by rds_rdma is not freed restrack: ------------[ cut here ]------------ --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@googlegroups.com. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [syzbot] BUG: RESTRACK detected leak of resources 2021-10-04 10:45 [syzbot] BUG: RESTRACK detected leak of resources syzbot @ 2021-10-04 12:42 ` Dmitry Vyukov 2021-10-04 13:15 ` Jason Gunthorpe 0 siblings, 1 reply; 8+ messages in thread From: Dmitry Vyukov @ 2021-10-04 12:42 UTC (permalink / raw) To: Doug Ledford, syzbot, Jason Gunthorpe, Leon Romanovsky, RDMA mailing list Cc: linux-kernel, syzkaller-bugs On Mon, 4 Oct 2021 at 12:45, syzbot <syzbot+3a992c9e4fd9f0e6fd0e@syzkaller.appspotmail.com> wrote: > > Hello, > > syzbot found the following issue on: > > HEAD commit: c7b4d0e56a1d Add linux-next specific files for 20210930 > git tree: linux-next > console output: https://syzkaller.appspot.com/x/log.txt?x=104be6cb300000 > kernel config: https://syzkaller.appspot.com/x/.config?x=c9a1f6685aeb48bd > dashboard link: https://syzkaller.appspot.com/bug?extid=3a992c9e4fd9f0e6fd0e > compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 > > Unfortunately, I don't have any reproducer for this issue yet. > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > Reported-by: syzbot+3a992c9e4fd9f0e6fd0e@syzkaller.appspotmail.com +RESTRACK maintainers (it would also be good if RESTRACK would print a more standard oops with stack/filenames, so that testing systems can attribute issues to files/maintainers). > rdma_rxe: rxe-pd pool destroyed with unfree'd elem > rdma_rxe: rxe-mr pool destroyed with unfree'd elem > restrack: ------------[ cut here ]------------ > infiniband syz0: BUG: RESTRACK detected leak of resources > restrack: Kernel PD object allocated by rds_rdma is not freed > restrack: ------------[ cut here ]------------ > > > --- > This report is generated by a bot. It may contain errors. > See https://goo.gl/tpsmEJ for more information about syzbot. > syzbot engineers can be reached at syzkaller@googlegroups.com. > > syzbot will keep track of this issue. See: > https://goo.gl/tpsmEJ#status for how to communicate with syzbot. ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [syzbot] BUG: RESTRACK detected leak of resources 2021-10-04 12:42 ` Dmitry Vyukov @ 2021-10-04 13:15 ` Jason Gunthorpe 2021-10-04 13:22 ` Dmitry Vyukov 2021-10-06 10:10 ` Leon Romanovsky 0 siblings, 2 replies; 8+ messages in thread From: Jason Gunthorpe @ 2021-10-04 13:15 UTC (permalink / raw) To: Dmitry Vyukov Cc: Doug Ledford, syzbot, Leon Romanovsky, RDMA mailing list, linux-kernel, syzkaller-bugs On Mon, Oct 04, 2021 at 02:42:11PM +0200, Dmitry Vyukov wrote: > On Mon, 4 Oct 2021 at 12:45, syzbot > <syzbot+3a992c9e4fd9f0e6fd0e@syzkaller.appspotmail.com> wrote: > > > > Hello, > > > > syzbot found the following issue on: > > > > HEAD commit: c7b4d0e56a1d Add linux-next specific files for 20210930 > > git tree: linux-next > > console output: https://syzkaller.appspot.com/x/log.txt?x=104be6cb300000 > > kernel config: https://syzkaller.appspot.com/x/.config?x=c9a1f6685aeb48bd > > dashboard link: https://syzkaller.appspot.com/bug?extid=3a992c9e4fd9f0e6fd0e > > compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 > > > > Unfortunately, I don't have any reproducer for this issue yet. > > > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > > Reported-by: syzbot+3a992c9e4fd9f0e6fd0e@syzkaller.appspotmail.com > > +RESTRACK maintainers > > (it would also be good if RESTRACK would print a more standard oops > with stack/filenames, so that testing systems can attribute issues to > files/maintainers). restrack certainly should trigger a WARN_ON to stop the kernel.. But I don't know what stack track would be useful here. The culprit is always the underlying driver, not the core code.. Anyhow, this report is either rxe or rds by the look of it. Jason ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [syzbot] BUG: RESTRACK detected leak of resources 2021-10-04 13:15 ` Jason Gunthorpe @ 2021-10-04 13:22 ` Dmitry Vyukov 2021-10-04 16:02 ` Haakon Bugge 2021-10-06 10:10 ` Leon Romanovsky 1 sibling, 1 reply; 8+ messages in thread From: Dmitry Vyukov @ 2021-10-04 13:22 UTC (permalink / raw) To: Jason Gunthorpe Cc: Doug Ledford, syzbot, Leon Romanovsky, RDMA mailing list, linux-kernel, syzkaller-bugs On Mon, 4 Oct 2021 at 15:15, Jason Gunthorpe <jgg@ziepe.ca> wrote: > > On Mon, Oct 04, 2021 at 02:42:11PM +0200, Dmitry Vyukov wrote: > > On Mon, 4 Oct 2021 at 12:45, syzbot > > <syzbot+3a992c9e4fd9f0e6fd0e@syzkaller.appspotmail.com> wrote: > > > > > > Hello, > > > > > > syzbot found the following issue on: > > > > > > HEAD commit: c7b4d0e56a1d Add linux-next specific files for 20210930 > > > git tree: linux-next > > > console output: https://syzkaller.appspot.com/x/log.txt?x=104be6cb300000 > > > kernel config: https://syzkaller.appspot.com/x/.config?x=c9a1f6685aeb48bd > > > dashboard link: https://syzkaller.appspot.com/bug?extid=3a992c9e4fd9f0e6fd0e > > > compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 > > > > > > Unfortunately, I don't have any reproducer for this issue yet. > > > > > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > > > Reported-by: syzbot+3a992c9e4fd9f0e6fd0e@syzkaller.appspotmail.com > > > > +RESTRACK maintainers > > > > (it would also be good if RESTRACK would print a more standard oops > > with stack/filenames, so that testing systems can attribute issues to > > files/maintainers). > > restrack certainly should trigger a WARN_ON to stop the kernel.. But I > don't know what stack track would be useful here. The culprit is > always the underlying driver, not the core code.. There seems to be a significant overlap between drivers/infiniband/core/restrack.c and drivers/infiniband/sw/rxe/rxe.c maintainers, so perhaps restrack.c is good enough approximation to extract relevant people (definitely better then no CC at all :)) > Anyhow, this report is either rxe or rds by the look of it. > > Jason ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [syzbot] BUG: RESTRACK detected leak of resources 2021-10-04 13:22 ` Dmitry Vyukov @ 2021-10-04 16:02 ` Haakon Bugge 2021-10-05 13:11 ` Zhu Yanjun 0 siblings, 1 reply; 8+ messages in thread From: Haakon Bugge @ 2021-10-04 16:02 UTC (permalink / raw) To: Dmitry Vyukov Cc: Jason Gunthorpe, Doug Ledford, syzbot, Leon Romanovsky, OFED mailing list, LKML, syzkaller-bugs > On 4 Oct 2021, at 15:22, Dmitry Vyukov <dvyukov@google.com> wrote: > > On Mon, 4 Oct 2021 at 15:15, Jason Gunthorpe <jgg@ziepe.ca> wrote: >> >> On Mon, Oct 04, 2021 at 02:42:11PM +0200, Dmitry Vyukov wrote: >>> On Mon, 4 Oct 2021 at 12:45, syzbot >>> <syzbot+3a992c9e4fd9f0e6fd0e@syzkaller.appspotmail.com> wrote: >>>> >>>> Hello, >>>> >>>> syzbot found the following issue on: >>>> >>>> HEAD commit: c7b4d0e56a1d Add linux-next specific files for 20210930 >>>> git tree: linux-next >>>> console output: https://syzkaller.appspot.com/x/log.txt?x=104be6cb300000 >>>> kernel config: https://syzkaller.appspot.com/x/.config?x=c9a1f6685aeb48bd >>>> dashboard link: https://syzkaller.appspot.com/bug?extid=3a992c9e4fd9f0e6fd0e >>>> compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 >>>> >>>> Unfortunately, I don't have any reproducer for this issue yet. >>>> >>>> IMPORTANT: if you fix the issue, please add the following tag to the commit: >>>> Reported-by: syzbot+3a992c9e4fd9f0e6fd0e@syzkaller.appspotmail.com >>> >>> +RESTRACK maintainers >>> >>> (it would also be good if RESTRACK would print a more standard oops >>> with stack/filenames, so that testing systems can attribute issues to >>> files/maintainers). >> >> restrack certainly should trigger a WARN_ON to stop the kernel.. But I >> don't know what stack track would be useful here. The culprit is >> always the underlying driver, not the core code.. > > There seems to be a significant overlap between > drivers/infiniband/core/restrack.c and drivers/infiniband/sw/rxe/rxe.c > maintainers, so perhaps restrack.c is good enough approximation to > extract relevant people (definitely better then no CC at all :)) Looks to me as this is rxe: [ 1892.778632][ T8958] BUG: KASAN: use-after-free in __rxe_drop_index_locked+0xb5/0x100 [snip] [ 1892.822375][ T8958] Call Trace: [ 1892.825655][ T8958] <TASK> [ 1892.828594][ T8958] dump_stack_lvl+0xcd/0x134 [ 1892.833273][ T8958] print_address_description.constprop.0.cold+0x6c/0x30c [ 1892.840316][ T8958] ? __rxe_drop_index_locked+0xb5/0x100 [ 1892.845864][ T8958] ? __rxe_drop_index_locked+0xb5/0x100 [ 1892.851424][ T8958] kasan_report.cold+0x83/0xdf [ 1892.856200][ T8958] ? __rxe_drop_index_locked+0xb5/0x100 [ 1892.861761][ T8958] kasan_check_range+0x13d/0x180 [ 1892.866780][ T8958] __rxe_drop_index_locked+0xb5/0x100 [ 1892.872164][ T8958] __rxe_drop_index+0x3f/0x60 [ 1892.876850][ T8958] rxe_dereg_mr+0x14b/0x240 [ 1892.881381][ T8958] ib_dealloc_pd_user+0x96/0x230 [ 1892.886566][ T8958] rds_ib_dev_free+0xd4/0x3a0 So, RDS de-allocs its PD, ib core must first de-register the PD's local MR, calls rxe_dereg_mr(), ... Thxs, Håkon > >> Anyhow, this report is either rxe or rds by the look of it. >> >> Jason ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [syzbot] BUG: RESTRACK detected leak of resources 2021-10-04 16:02 ` Haakon Bugge @ 2021-10-05 13:11 ` Zhu Yanjun 2021-10-05 23:01 ` Bob Pearson 0 siblings, 1 reply; 8+ messages in thread From: Zhu Yanjun @ 2021-10-05 13:11 UTC (permalink / raw) To: Haakon Bugge Cc: Dmitry Vyukov, Jason Gunthorpe, Doug Ledford, syzbot, Leon Romanovsky, OFED mailing list, LKML, syzkaller-bugs On Tue, Oct 5, 2021 at 1:56 AM Haakon Bugge <haakon.bugge@oracle.com> wrote: > > > > > On 4 Oct 2021, at 15:22, Dmitry Vyukov <dvyukov@google.com> wrote: > > > > On Mon, 4 Oct 2021 at 15:15, Jason Gunthorpe <jgg@ziepe.ca> wrote: > >> > >> On Mon, Oct 04, 2021 at 02:42:11PM +0200, Dmitry Vyukov wrote: > >>> On Mon, 4 Oct 2021 at 12:45, syzbot > >>> <syzbot+3a992c9e4fd9f0e6fd0e@syzkaller.appspotmail.com> wrote: > >>>> > >>>> Hello, > >>>> > >>>> syzbot found the following issue on: > >>>> > >>>> HEAD commit: c7b4d0e56a1d Add linux-next specific files for 20210930 > >>>> git tree: linux-next > >>>> console output: https://syzkaller.appspot.com/x/log.txt?x=104be6cb300000 > >>>> kernel config: https://syzkaller.appspot.com/x/.config?x=c9a1f6685aeb48bd > >>>> dashboard link: https://syzkaller.appspot.com/bug?extid=3a992c9e4fd9f0e6fd0e > >>>> compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 > >>>> > >>>> Unfortunately, I don't have any reproducer for this issue yet. > >>>> > >>>> IMPORTANT: if you fix the issue, please add the following tag to the commit: > >>>> Reported-by: syzbot+3a992c9e4fd9f0e6fd0e@syzkaller.appspotmail.com > >>> > >>> +RESTRACK maintainers > >>> > >>> (it would also be good if RESTRACK would print a more standard oops > >>> with stack/filenames, so that testing systems can attribute issues to > >>> files/maintainers). > >> > >> restrack certainly should trigger a WARN_ON to stop the kernel.. But I > >> don't know what stack track would be useful here. The culprit is > >> always the underlying driver, not the core code.. > > > > There seems to be a significant overlap between > > drivers/infiniband/core/restrack.c and drivers/infiniband/sw/rxe/rxe.c > > maintainers, so perhaps restrack.c is good enough approximation to > > extract relevant people (definitely better then no CC at all :)) > > Looks to me as this is rxe: > > [ 1892.778632][ T8958] BUG: KASAN: use-after-free in __rxe_drop_index_locked+0xb5/0x100 > [snip] > [ 1892.822375][ T8958] Call Trace: > [ 1892.825655][ T8958] <TASK> > [ 1892.828594][ T8958] dump_stack_lvl+0xcd/0x134 > [ 1892.833273][ T8958] print_address_description.constprop.0.cold+0x6c/0x30c > [ 1892.840316][ T8958] ? __rxe_drop_index_locked+0xb5/0x100 > [ 1892.845864][ T8958] ? __rxe_drop_index_locked+0xb5/0x100 > [ 1892.851424][ T8958] kasan_report.cold+0x83/0xdf > [ 1892.856200][ T8958] ? __rxe_drop_index_locked+0xb5/0x100 > [ 1892.861761][ T8958] kasan_check_range+0x13d/0x180 > [ 1892.866780][ T8958] __rxe_drop_index_locked+0xb5/0x100 > [ 1892.872164][ T8958] __rxe_drop_index+0x3f/0x60 > [ 1892.876850][ T8958] rxe_dereg_mr+0x14b/0x240 > [ 1892.881381][ T8958] ib_dealloc_pd_user+0x96/0x230 > [ 1892.886566][ T8958] rds_ib_dev_free+0xd4/0x3a0 > > So, RDS de-allocs its PD, ib core must first de-register the PD's local MR, calls rxe_dereg_mr(), ... int rxe_dereg_mr(struct ib_mr *ibmr, struct ib_udata *udata) { struct rxe_mr *mr = to_rmr(ibmr); if (atomic_read(&mr->num_mw) > 0) { pr_warn("%s: Attempt to deregister an MR while bound to MWs\n", __func__); return -EINVAL; } mr->state = RXE_MR_STATE_ZOMBIE; rxe_drop_ref(mr_pd(mr)); rxe_drop_index(mr); <-------This is call trace beginning. rxe_drop_ref(mr); return 0; } struct rxe_mr { struct rxe_pool_entry pelem; <-----A ref_cnt in this struct. struct ib_mr ibmr; struct ib_umem *umem; struct rxe_pool_entry { struct rxe_pool *pool; struct kref ref_cnt; <-------This ref_cnt may help. struct list_head list; Zhu Yanjun > > > Thxs, Håkon > > > > > >> Anyhow, this report is either rxe or rds by the look of it. > >> > >> Jason > ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [syzbot] BUG: RESTRACK detected leak of resources 2021-10-05 13:11 ` Zhu Yanjun @ 2021-10-05 23:01 ` Bob Pearson 0 siblings, 0 replies; 8+ messages in thread From: Bob Pearson @ 2021-10-05 23:01 UTC (permalink / raw) To: Zhu Yanjun, Haakon Bugge Cc: Dmitry Vyukov, Jason Gunthorpe, Doug Ledford, syzbot, Leon Romanovsky, OFED mailing list, LKML, syzkaller-bugs On 10/5/21 8:11 AM, Zhu Yanjun wrote: > On Tue, Oct 5, 2021 at 1:56 AM Haakon Bugge <haakon.bugge@oracle.com> wrote: >> >> >> >>> On 4 Oct 2021, at 15:22, Dmitry Vyukov <dvyukov@google.com> wrote: >>> >>> On Mon, 4 Oct 2021 at 15:15, Jason Gunthorpe <jgg@ziepe.ca> wrote: >>>> >>>> On Mon, Oct 04, 2021 at 02:42:11PM +0200, Dmitry Vyukov wrote: >>>>> On Mon, 4 Oct 2021 at 12:45, syzbot >>>>> <syzbot+3a992c9e4fd9f0e6fd0e@syzkaller.appspotmail.com> wrote: >>>>>> >>>>>> Hello, >>>>>> >>>>>> syzbot found the following issue on: >>>>>> >>>>>> HEAD commit: c7b4d0e56a1d Add linux-next specific files for 20210930 >>>>>> git tree: linux-next >>>>>> console output: https://syzkaller.appspot.com/x/log.txt?x=104be6cb300000 >>>>>> kernel config: https://syzkaller.appspot.com/x/.config?x=c9a1f6685aeb48bd >>>>>> dashboard link: https://syzkaller.appspot.com/bug?extid=3a992c9e4fd9f0e6fd0e >>>>>> compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 >>>>>> >>>>>> Unfortunately, I don't have any reproducer for this issue yet. >>>>>> >>>>>> IMPORTANT: if you fix the issue, please add the following tag to the commit: >>>>>> Reported-by: syzbot+3a992c9e4fd9f0e6fd0e@syzkaller.appspotmail.com >>>>> >>>>> +RESTRACK maintainers >>>>> >>>>> (it would also be good if RESTRACK would print a more standard oops >>>>> with stack/filenames, so that testing systems can attribute issues to >>>>> files/maintainers). >>>> >>>> restrack certainly should trigger a WARN_ON to stop the kernel.. But I >>>> don't know what stack track would be useful here. The culprit is >>>> always the underlying driver, not the core code.. >>> >>> There seems to be a significant overlap between >>> drivers/infiniband/core/restrack.c and drivers/infiniband/sw/rxe/rxe.c >>> maintainers, so perhaps restrack.c is good enough approximation to >>> extract relevant people (definitely better then no CC at all :)) >> >> Looks to me as this is rxe: >> >> [ 1892.778632][ T8958] BUG: KASAN: use-after-free in __rxe_drop_index_locked+0xb5/0x100 >> [snip] >> [ 1892.822375][ T8958] Call Trace: >> [ 1892.825655][ T8958] <TASK> >> [ 1892.828594][ T8958] dump_stack_lvl+0xcd/0x134 >> [ 1892.833273][ T8958] print_address_description.constprop.0.cold+0x6c/0x30c >> [ 1892.840316][ T8958] ? __rxe_drop_index_locked+0xb5/0x100 >> [ 1892.845864][ T8958] ? __rxe_drop_index_locked+0xb5/0x100 >> [ 1892.851424][ T8958] kasan_report.cold+0x83/0xdf >> [ 1892.856200][ T8958] ? __rxe_drop_index_locked+0xb5/0x100 >> [ 1892.861761][ T8958] kasan_check_range+0x13d/0x180 >> [ 1892.866780][ T8958] __rxe_drop_index_locked+0xb5/0x100 >> [ 1892.872164][ T8958] __rxe_drop_index+0x3f/0x60 >> [ 1892.876850][ T8958] rxe_dereg_mr+0x14b/0x240 >> [ 1892.881381][ T8958] ib_dealloc_pd_user+0x96/0x230 >> [ 1892.886566][ T8958] rds_ib_dev_free+0xd4/0x3a0 >> >> So, RDS de-allocs its PD, ib core must first de-register the PD's local MR, calls rxe_dereg_mr(), ... > > int rxe_dereg_mr(struct ib_mr *ibmr, struct ib_udata *udata) > { > struct rxe_mr *mr = to_rmr(ibmr); > > if (atomic_read(&mr->num_mw) > 0) { > pr_warn("%s: Attempt to deregister an MR while bound to MWs\n", > __func__); > return -EINVAL; > } > > mr->state = RXE_MR_STATE_ZOMBIE; > rxe_drop_ref(mr_pd(mr)); > rxe_drop_index(mr); <-------This is call trace beginning. > rxe_drop_ref(mr); > > return 0; > } > > struct rxe_mr { > struct rxe_pool_entry pelem; <-----A ref_cnt in this struct. > struct ib_mr ibmr; > > struct ib_umem *umem; > > struct rxe_pool_entry { > struct rxe_pool *pool; > struct kref ref_cnt; <-------This ref_cnt may help. > struct list_head list; > > Zhu Yanjun > >> >> >> Thxs, Håkon >> >> >>> >>>> Anyhow, this report is either rxe or rds by the look of it. >>>> >>>> Jason >> It looks like not all the objects are getting freed before the CA is deallocated. If this happens the pool cleanup code issues the warning that the pool is being cleaned up with some objects still in the pool. It then goes ahead and frees the index table for indexed objects (like MRs). If the MR is later freed it tries to remove its index in the index bit map which has already been freed causing the oops. The MR not getting freed in time is the cause of the late deallocation of the PD which was noticed by restrak. I am not sure if these late deletions are just the normal flow of the program or caused by rdma core trying to clean up afterwards. Normally MRs get a reference taken when they are created and dropped when they are freed. Additionally references are taken when an lkey or rkey is looked up an turned into a pointer to the MR object. These are normally dropped when the key goes out of scope. If an error occurs it may be possible that the key goes out of scope without dropping the reference to the MR which would cause what we are seeing. In this case in order for the late deletion of the MR someone would have to call dereg mr a second time to remove the lost ref count. It would be helpful to have a test case to trigger this oops. ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: [syzbot] BUG: RESTRACK detected leak of resources 2021-10-04 13:15 ` Jason Gunthorpe 2021-10-04 13:22 ` Dmitry Vyukov @ 2021-10-06 10:10 ` Leon Romanovsky 1 sibling, 0 replies; 8+ messages in thread From: Leon Romanovsky @ 2021-10-06 10:10 UTC (permalink / raw) To: Jason Gunthorpe Cc: Dmitry Vyukov, Doug Ledford, syzbot, RDMA mailing list, linux-kernel, syzkaller-bugs On Mon, Oct 04, 2021 at 10:15:16AM -0300, Jason Gunthorpe wrote: > On Mon, Oct 04, 2021 at 02:42:11PM +0200, Dmitry Vyukov wrote: > > On Mon, 4 Oct 2021 at 12:45, syzbot > > <syzbot+3a992c9e4fd9f0e6fd0e@syzkaller.appspotmail.com> wrote: > > > > > > Hello, > > > > > > syzbot found the following issue on: > > > > > > HEAD commit: c7b4d0e56a1d Add linux-next specific files for 20210930 > > > git tree: linux-next > > > console output: https://syzkaller.appspot.com/x/log.txt?x=104be6cb300000 > > > kernel config: https://syzkaller.appspot.com/x/.config?x=c9a1f6685aeb48bd > > > dashboard link: https://syzkaller.appspot.com/bug?extid=3a992c9e4fd9f0e6fd0e > > > compiler: gcc (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.2 > > > > > > Unfortunately, I don't have any reproducer for this issue yet. > > > > > > IMPORTANT: if you fix the issue, please add the following tag to the commit: > > > Reported-by: syzbot+3a992c9e4fd9f0e6fd0e@syzkaller.appspotmail.com > > > > +RESTRACK maintainers > > > > (it would also be good if RESTRACK would print a more standard oops > > with stack/filenames, so that testing systems can attribute issues to > > files/maintainers). > > restrack certainly should trigger a WARN_ON to stop the kernel.. But I > don't know what stack track would be useful here. The culprit is > always the underlying driver, not the core code.. We had WARN_ON() in early versions, but it didn't give us anything except spammed dmesg, so I changed it to more lighter version. > > Anyhow, this report is either rxe or rds by the look of it. > > Jason ^ permalink raw reply [flat|nested] 8+ messages in thread
end of thread, other threads:[~2021-10-06 10:10 UTC | newest] Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2021-10-04 10:45 [syzbot] BUG: RESTRACK detected leak of resources syzbot 2021-10-04 12:42 ` Dmitry Vyukov 2021-10-04 13:15 ` Jason Gunthorpe 2021-10-04 13:22 ` Dmitry Vyukov 2021-10-04 16:02 ` Haakon Bugge 2021-10-05 13:11 ` Zhu Yanjun 2021-10-05 23:01 ` Bob Pearson 2021-10-06 10:10 ` Leon Romanovsky
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