syzbot


INFO: task hung in hwrng_fillfn

Status: fixed on 2024/01/30 15:47
Subsystems: crypto
[Documentation on labels]
Reported-by: syzbot+c52ab18308964d248092@syzkaller.appspotmail.com
Fix commit: 78aafb3884f6 hwrng: core - Fix page fault dead lock on mmap-ed hwrng
First crash: 199d, last: 113d
Cause bisection: failed (error log, bisect log)
  
Discussions (4)
Title Replies (including bot) Last reply
Re: [PATCH] hwrng: core - fix task hung in hwrng_fillfn 3 (3) 2023/12/12 14:03
Re: [PATCH] hwrng: core - fix task hung in hwrng_fillfn 1 (1) 2023/12/01 11:41
Re: [PATCH] hwrng: core - fix task hung in hwrng_fillfn 1 (1) 2023/12/01 09:56
[syzbot] [crypto?] INFO: task hung in hwrng_fillfn 0 (6) 2023/11/29 02:59
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
linux-6.1 INFO: task hung in hwrng_fillfn 4 113d 216d 0/3 auto-obsoleted due to no activity on 2024/05/07 11:12
linux-5.15 INFO: task hung in hwrng_fillfn 1 108d 108d 0/3 auto-obsoleted due to no activity on 2024/05/11 14:43
Last patch testing requests (6)
Created Duration User Patch Repo Result
2023/11/29 02:59 22m eadavis@qq.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 6e2332e0ab53 report log
2023/11/26 05:35 23m eadavis@qq.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 98b1cc82c4af OK log
2023/11/26 04:06 25m eadavis@qq.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 98b1cc82c4af OK log
2023/11/26 04:05 5m eadavis@qq.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 98b1cc82c4af error OK
2023/11/26 03:52 4m eadavis@qq.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 98b1cc82c4af error OK
2023/11/26 01:57 22m hdanton@sina.com patch https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master OK log

Sample crash report:
INFO: task hwrng:749 blocked for more than 143 seconds.
      Not tainted 6.7.0-rc2-syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:hwrng           state:D stack:29040 pid:749   tgid:749   ppid:2      flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5376 [inline]
 __schedule+0xedb/0x5af0 kernel/sched/core.c:6688
 __schedule_loop kernel/sched/core.c:6763 [inline]
 schedule+0xe9/0x270 kernel/sched/core.c:6778
 schedule_preempt_disabled+0x13/0x20 kernel/sched/core.c:6835
 __mutex_lock_common kernel/locking/mutex.c:679 [inline]
 __mutex_lock+0x5b9/0x9d0 kernel/locking/mutex.c:747
 hwrng_fillfn+0x145/0x430 drivers/char/hw_random/core.c:504
 kthread+0x2c6/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
 </TASK>

Showing all locks held in the system:
1 lock held by khungtaskd/29:
 #0: ffffffff8cfabce0 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:301 [inline]
 #0: ffffffff8cfabce0 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:747 [inline]
 #0: ffffffff8cfabce0 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x75/0x340 kernel/locking/lockdep.c:6613
2 locks held by kswapd0/86:
1 lock held by hwrng/749:
 #0: ffffffff8dbafee8 (reading_mutex){+.+.}-{3:3}, at: hwrng_fillfn+0x145/0x430 drivers/char/hw_random/core.c:504
2 locks held by getty/4824:
 #0: ffff888025fa10a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
 #1: ffffc90002f062f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0xfc6/0x1490 drivers/tty/n_tty.c:2201
2 locks held by syz-executor391/5105:
2 locks held by syz-executor391/5106:

=============================================

NMI backtrace for cpu 1
CPU: 1 PID: 29 Comm: khungtaskd Not tainted 6.7.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xd9/0x1b0 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x277/0x390 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x299/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:222 [inline]
 watchdog+0xf87/0x1210 kernel/hung_task.c:379
 kthread+0x2c6/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 5105 Comm: syz-executor391 Not tainted 6.7.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
RIP: 0010:__lock_acquire+0x30/0x3b10 kernel/locking/lockdep.c:4992
Code: f6 41 55 41 54 49 89 fc 55 89 d5 53 44 89 cb 48 81 ec f0 00 00 00 48 8b 84 24 28 01 00 00 48 c7 84 24 90 00 00 00 b3 8a b5 41 <44> 89 44 24 08 44 8b ac 24 48 01 00 00 48 c7 84 24 98 00 00 00 1b
RSP: 0018:ffffc900044271d8 EFLAGS: 00000086
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000002
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff8cfabce0
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff8f1934d7 R11: 0000000000000002 R12: ffffffff8cfabce0
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS:  00007f3c785f96c0(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005565d7bb9be7 CR3: 000000001af30000 CR4: 0000000000350ef0
Call Trace:
 <NMI>
 </NMI>
 <TASK>
 lock_acquire kernel/locking/lockdep.c:5753 [inline]
 lock_acquire+0x1ae/0x520 kernel/locking/lockdep.c:5718
 rcu_lock_acquire include/linux/rcupdate.h:301 [inline]
 rcu_read_lock include/linux/rcupdate.h:747 [inline]
 get_mem_cgroup_from_mm+0x4b/0x4c0 mm/memcontrol.c:1081
 __mem_cgroup_charge+0x1c/0x140 mm/memcontrol.c:7224
 mem_cgroup_charge include/linux/memcontrol.h:684 [inline]
 __filemap_add_folio+0x88c/0xed0 mm/filemap.c:854
 filemap_add_folio+0xb1/0x1e0 mm/filemap.c:937
 page_cache_ra_unbounded+0x1d0/0x5f0 mm/readahead.c:250
 do_page_cache_ra mm/readahead.c:299 [inline]
 page_cache_ra_order+0x72b/0xa80 mm/readahead.c:546
 do_sync_mmap_readahead mm/filemap.c:3141 [inline]
 filemap_fault+0x16a8/0x3570 mm/filemap.c:3233
 __do_fault+0x107/0x600 mm/memory.c:4265
 do_cow_fault mm/memory.c:4662 [inline]
 do_fault mm/memory.c:4764 [inline]
 do_pte_missing mm/memory.c:3730 [inline]
 handle_pte_fault mm/memory.c:5038 [inline]
 __handle_mm_fault+0x3a8d/0x3d70 mm/memory.c:5179
 handle_mm_fault+0x47a/0xa10 mm/memory.c:5344
 do_user_addr_fault+0x3d1/0x1000 arch/x86/mm/fault.c:1413
 handle_page_fault arch/x86/mm/fault.c:1505 [inline]
 exc_page_fault+0x5d/0xc0 arch/x86/mm/fault.c:1561
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:570
RIP: 0010:rep_movs_alternative+0x57/0x70 arch/x86/lib/copy_user_64.S:80
Code: 00 66 90 48 8b 06 48 89 07 48 83 c6 08 48 83 c7 08 83 e9 08 74 df 83 f9 08 73 e8 eb c9 eb 01 c3 48 89 c8 48 c1 e9 03 83 e0 07 <f3> 48 a5 89 c1 85 c9 75 b3 c3 48 8d 0c c8 eb ac 66 0f 1f 84 00 00
RSP: 0018:ffffc90004427bb0 EFLAGS: 00050246
RAX: 0000000000000000 RBX: 0000000000000040 RCX: 0000000000000008
RDX: ffffed1028a4ab48 RSI: ffff888145255a00 RDI: 0000000020019980
RBP: 0000000020019980 R08: 0000000000000000 R09: ffffed1028a4ab47
R10: ffff888145255a3f R11: 0000000000000001 R12: ffff888145255a00
R13: 00000000200199c0 R14: 0000000000000000 R15: dffffc0000000000
 copy_user_generic arch/x86/include/asm/uaccess_64.h:112 [inline]
 raw_copy_to_user arch/x86/include/asm/uaccess_64.h:133 [inline]
 _copy_to_user lib/usercopy.c:41 [inline]
 _copy_to_user+0xa8/0xb0 lib/usercopy.c:34
 copy_to_user include/linux/uaccess.h:191 [inline]
 rng_dev_read+0x184/0x580 drivers/char/hw_random/core.c:255
 do_loop_readv_writev fs/read_write.c:755 [inline]
 do_loop_readv_writev fs/read_write.c:743 [inline]
 do_iter_read+0x567/0x830 fs/read_write.c:797
 vfs_readv+0x12d/0x1a0 fs/read_write.c:915
 do_preadv fs/read_write.c:1007 [inline]
 __do_sys_preadv fs/read_write.c:1057 [inline]
 __se_sys_preadv fs/read_write.c:1052 [inline]
 __x64_sys_preadv+0x228/0x300 fs/read_write.c:1052
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x40/0x110 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x63/0x6b
RIP: 0033:0x7f3c78638b29
Code: Unable to access opcode bytes at 0x7f3c78638aff.
RSP: 002b:00007f3c785f9168 EFLAGS: 00000246 ORIG_RAX: 0000000000000127
RAX: ffffffffffffffda RBX: 00007f3c786c2328 RCX: 00007f3c78638b29
RDX: 0000000000000001 RSI: 0000000020001880 RDI: 0000000000000003
RBP: 00007f3c786c2320 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f3c786c232c
R13: 0000000000000000 R14: 00007ffc8a220310 R15: 00007ffc8a2203f8
 </TASK>
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.464 msecs

Crashes (27):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2023/11/21 13:09 upstream 98b1cc82c4af cb976f63 .config console log report syz C [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in hwrng_fillfn
2024/01/11 00:25 upstream ab27740f7665 04815ef1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in hwrng_fillfn
2024/01/11 00:12 upstream ab27740f7665 04815ef1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in hwrng_fillfn
2024/01/10 21:21 upstream ab27740f7665 04815ef1 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in hwrng_fillfn
2024/01/10 00:56 upstream 6c1dd1fe5d8a b438bd66 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in hwrng_fillfn
2024/01/09 06:42 upstream 5db8752c3b81 4c0fd4bb .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in hwrng_fillfn
2024/01/07 17:22 upstream 52b1853b080a d0304e9c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in hwrng_fillfn
2024/01/01 23:36 upstream 610a9b8f49fb fb427a07 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in hwrng_fillfn
2024/01/01 22:47 upstream 610a9b8f49fb fb427a07 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in hwrng_fillfn
2023/12/30 16:38 upstream f016f7547aee fb427a07 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in hwrng_fillfn
2023/12/29 21:52 upstream 8735c7c84d1b fb427a07 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in hwrng_fillfn
2023/12/29 10:55 upstream 505e701c0b2c fb427a07 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in hwrng_fillfn
2023/12/22 02:20 upstream a4aebe936554 4f9530a3 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in hwrng_fillfn
2023/12/17 13:41 upstream 3b8a9b2e6809 3222d10c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in hwrng_fillfn
2023/12/13 00:50 upstream eaadbbaaff74 ebcad15c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in hwrng_fillfn
2023/12/10 02:54 upstream b10a3ccaf6e3 28b24332 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in hwrng_fillfn
2023/12/01 11:19 upstream e8f60209d6cf f819d6f7 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-smack-root INFO: task hung in hwrng_fillfn
2023/11/25 05:16 upstream f1a09972a45a 5b429f39 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in hwrng_fillfn
2023/11/21 08:40 upstream 98b1cc82c4af cb976f63 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in hwrng_fillfn
2023/11/18 04:13 upstream 6bc40e44f1dd cb976f63 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in hwrng_fillfn
2023/11/16 07:57 upstream c42d9eeef8e5 cb976f63 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce INFO: task hung in hwrng_fillfn
2023/11/09 00:15 upstream 305230142ae0 df3908d6 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in hwrng_fillfn
2023/11/05 07:31 upstream aea6bf908d73 500bfdc4 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-selinux-root INFO: task hung in hwrng_fillfn
2023/11/03 09:12 upstream 4652b8e4f3ff c4ac074c .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-kasan-gce-root INFO: task hung in hwrng_fillfn
2023/12/10 07:08 linux-next 8e00ce02066e 28b24332 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-linux-next-kasan-gce-root INFO: task hung in hwrng_fillfn
2024/01/28 11:00 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 0802e17d9aca cc4a4020 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 INFO: task hung in hwrng_fillfn
2024/01/23 03:07 git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci 0802e17d9aca 1c0ecc51 .config console log report info [disk image] [vmlinux] [kernel image] ci-upstream-gce-arm64 INFO: task hung in hwrng_fillfn
* Struck through repros no longer work on HEAD.