syzbot


INFO: task hung in dump_header

Status: auto-closed as invalid on 2019/07/25 03:27
Subsystems: mm
[Documentation on labels]
First crash: 1995d, last: 1995d
Similar bugs (3)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-4.19 INFO: task hung in dump_header (2) 4 908d 933d 0/1 auto-closed as invalid on 2022/05/17 01:18
android-414 INFO: task hung in dump_header 1 2036d 1917d 0/1 auto-closed as invalid on 2019/06/13 23:57
linux-4.19 INFO: task hung in dump_header 1 1672d 1672d 0/1 auto-closed as invalid on 2020/04/12 06:53

Sample crash report:
343989 pages reserved
0 pages cma reserved
oom-kill:constraint=CONSTRAINT_NONE,nodemask=(null),cpuset=/,mems_allowed=0-1,global_oom,task_memcg=/syz0,task=syz-executor0,pid=4255,uid=0
Out of memory: Kill process 4255 (syz-executor0) score 1005 or sacrifice child
Killed process 4255 (syz-executor0) total-vm:72708kB, anon-rss:2200kB, file-rss:34816kB, shmem-rss:0kB
INFO: task udevd:3866 blocked for more than 140 seconds.
      Not tainted 5.0.0-rc3+ #44
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
udevd           D15200  3866      1 0x00000000
udevd invoked oom-killer: gfp_mask=0x6200ca(GFP_HIGHUSER_MOVABLE), order=0, oom_score_adj=-1000
CPU: 1 PID: 4987 Comm: udevd Not tainted 5.0.0-rc3+ #44
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1db/0x2d0 lib/dump_stack.c:113
 dump_header+0x1e6/0x116c mm/oom_kill.c:451
Call Trace:
 context_switch kernel/sched/core.c:2831 [inline]
 __schedule+0x897/0x1e60 kernel/sched/core.c:3472
 oom_kill_process.cold+0x10/0x9d4 mm/oom_kill.c:966
 schedule+0xfe/0x350 kernel/sched/core.c:3516
 out_of_memory+0x885/0x1420 mm/oom_kill.c:1133
 __alloc_pages_may_oom mm/page_alloc.c:3672 [inline]
 __alloc_pages_slowpath+0x2217/0x2cc0 mm/page_alloc.c:4385
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:3574
 __mutex_lock_common kernel/locking/mutex.c:1002 [inline]
 __mutex_lock+0xa3b/0x1670 kernel/locking/mutex.c:1072
 __alloc_pages_nodemask+0xa37/0xdc0 mm/page_alloc.c:4555
 alloc_pages_current+0x107/0x210 mm/mempolicy.c:2106
 alloc_pages include/linux/gfp.h:509 [inline]
 __page_cache_alloc mm/filemap.c:924 [inline]
 __page_cache_alloc+0x3cd/0x620 mm/filemap.c:909
 mutex_lock_nested+0x16/0x20 kernel/locking/mutex.c:1087
 page_cache_alloc include/linux/pagemap.h:234 [inline]
 generic_file_buffered_read mm/filemap.c:2261 [inline]
 generic_file_read_iter+0x1adb/0x2d40 mm/filemap.c:2350
 kernfs_iop_permission+0x66/0xb0 fs/kernfs/inode.c:301
 do_inode_permission fs/namei.c:386 [inline]
 inode_permission+0x36d/0x570 fs/namei.c:451
 may_lookup fs/namei.c:1702 [inline]
 link_path_walk.part.0+0xaad/0x1550 fs/namei.c:2084
 ext4_file_read_iter+0x180/0x3c0 fs/ext4/file.c:77
 call_read_iter include/linux/fs.h:1856 [inline]
 new_sync_read fs/read_write.c:406 [inline]
 __vfs_read+0x761/0xb20 fs/read_write.c:418
 link_path_walk fs/namei.c:2269 [inline]
 path_lookupat.isra.0+0xe3/0xba0 fs/namei.c:2317
 vfs_read+0x194/0x3e0 fs/read_write.c:452
 ksys_read+0x105/0x260 fs/read_write.c:578
 __do_sys_read fs/read_write.c:588 [inline]
 __se_sys_read fs/read_write.c:586 [inline]
 __x64_sys_read+0x73/0xb0 fs/read_write.c:586
 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x7f24407bc310
 filename_lookup+0x27a/0x530 fs/namei.c:2348
Code: Bad RIP value.
RSP: 002b:00007ffffe38b0d8 EFLAGS: 00000202 ORIG_RAX: 0000000000000000
RAX: ffffffffffffffda RBX: 00000000013ce030 RCX: 00007f24407bc310
RDX: 0000000000001000 RSI: 00007f24410bb000 RDI: 0000000000000008
RBP: 0000000000000000 R08: 00000000ffffffff R09: 0000000000000000
R10: 0000000000000022 R11: 0000000000000202 R12: 000000000000002c
R13: 00007ffffe38b230 R14: 000000000000002c R15: 00007ffffe38b230

Crashes (1):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/01/26 03:23 upstream ba6069759381 ebf7a37c .config console log report ci-upstream-kasan-gce-selinux-root
* Struck through repros no longer work on HEAD.