On Wed, Mar 28, 2018 at 02:56:01AM -0700, syzbot wrote: > syzbot has found reproducer for the following crash on upstream commit > 3eb2ce825ea1ad89d20f7a3b5780df850e4be274 (Sun Mar 25 22:44:30 2018 +0000) > Linux 4.16-rc7 > syzbot dashboard link: > https://syzkaller.appspot.com/bug?extid=449737930e1faf08523e > > So far this crash happened 38 times on upstream. > C reproducer: https://syzkaller.appspot.com/x/repro.c?id=6522989826801664 > syzkaller reproducer: > https://syzkaller.appspot.com/x/repro.syz?id=4513717152645120 > Raw console output: > https://syzkaller.appspot.com/x/log.txt?id=6625862883475456 > Kernel config: > https://syzkaller.appspot.com/x/.config?id=-8440362230543204781 > compiler: gcc (GCC) 7.1.1 20170620 > > IMPORTANT: if you fix the bug, please add the following tag to the commit: > Reported-by: syzbot+449737930e1faf08523e@xxxxxxxxxxxxxxxxxxxxxxxxx > It will help syzbot understand when the bug is fixed. > > INFO: task syzkaller681645:4295 blocked for more than 120 seconds. > Not tainted 4.16.0-rc7+ #3 > "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. > syzkaller681645 D20744 4295 4293 0x00000000 > Call Trace: > context_switch kernel/sched/core.c:2862 [inline] > __schedule+0x8fb/0x1ec0 kernel/sched/core.c:3440 > schedule+0xf5/0x430 kernel/sched/core.c:3499 > schedule_timeout+0x1a3/0x230 kernel/time/timer.c:1777 > do_wait_for_common kernel/sched/completion.c:86 [inline] > __wait_for_common kernel/sched/completion.c:107 [inline] > wait_for_common kernel/sched/completion.c:118 [inline] > wait_for_completion+0x415/0x770 kernel/sched/completion.c:139 > ucma_destroy_id+0x2f0/0x500 drivers/infiniband/core/ucma.c:611 > ucma_write+0x2d6/0x3d0 drivers/infiniband/core/ucma.c:1649 > __vfs_write+0xef/0x970 fs/read_write.c:480 > vfs_write+0x189/0x510 fs/read_write.c:544 > SYSC_write fs/read_write.c:589 [inline] > SyS_write+0xef/0x220 fs/read_write.c:581 > do_syscall_64+0x281/0x940 arch/x86/entry/common.c:287 > entry_SYSCALL_64_after_hwframe+0x42/0xb7 > RIP: 0033:0x440719 > RSP: 002b:00007ffc7e451f28 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 > RAX: ffffffffffffffda RBX: 00007ffc7e451f50 RCX: 0000000000440719 > RDX: 0000000000000018 RSI: 0000000020000080 RDI: 0000000000000003 > RBP: 0000000000000000 R08: 00007ffc7e451fa0 R09: 00007ffc7e451fa0 > R10: 00007ffc7e451fa0 R11: 0000000000000246 R12: 0000000000402040 > R13: 00000000004020d0 R14: 0000000000000000 R15: 0000000000000000 This was fixed by commit ef95a90ae6f4f2: #syz fix: RDMA/ucma: ucma_context reference leak in error path - Eric -- To unsubscribe from this list: send the line "unsubscribe linux-rdma" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
