[[0;32m OK [0m] Reached target Graphical Interface.
Starting Update UTMP about System Runlevel Changes...
[[0;32m OK [0m] Started Update UTMP about System Runlevel Changes.
Starting Load/Save RF Kill Switch Status...
[[0;32m OK [0m] Started Load/Save RF Kill Switch Status.
Debian GNU/Linux 9 syzkaller ttyS0
Warning: Permanently added '10.128.0.9' (ECDSA) to the list of known hosts.
executing program
syzkaller login: [ 34.919908] overlayfs: fs on './file0' does not support file handles, falling back to index=off,nfs_export=off.
[ 34.931644]
[ 34.933270] ======================================================
[ 34.939561] WARNING: possible circular locking dependency detected
[ 34.945873] 4.19.211-syzkaller #0 Not tainted
[ 34.950340] ------------------------------------------------------
[ 34.956646] syz-executor311/8106 is trying to acquire lock:
[ 34.962333] 00000000aab9ee55 (sb_writers#3){.+.+}, at: mnt_want_write+0x3a/0xb0
[ 34.969774]
[ 34.969774] but task is already holding lock:
[ 34.975735] 0000000043e7a252 (&iint->mutex){+.+.}, at: process_measurement+0x316/0x1440
[ 34.983872]
[ 34.983872] which lock already depends on the new lock.
[ 34.983872]
[ 34.992163]
[ 34.992163] the existing dependency chain (in reverse order) is:
[ 34.999760]
[ 34.999760] -> #1 (&iint->mutex){+.+.}:
[ 35.005262] process_measurement+0x316/0x1440
[ 35.010278] ima_file_check+0xb9/0x100
[ 35.014671] path_openat+0x7e4/0x2df0
[ 35.018972] do_filp_open+0x18c/0x3f0
[ 35.023272] do_sys_open+0x3b3/0x520
[ 35.027485] do_syscall_64+0xf9/0x620
[ 35.031803] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 35.037500]
[ 35.037500] -> #0 (sb_writers#3){.+.+}:
[ 35.042940] __sb_start_write+0x6e/0x2a0
[ 35.047501] mnt_want_write+0x3a/0xb0
[ 35.051821] ovl_maybe_copy_up+0x11f/0x190
[ 35.056557] ovl_open+0xb4/0x260
[ 35.060438] do_dentry_open+0x4aa/0x1160
[ 35.065000] dentry_open+0x132/0x1d0
[ 35.069213] ima_calc_file_hash+0x628/0x8a0
[ 35.074059] ima_collect_measurement+0x4c4/0x570
[ 35.079314] process_measurement+0xddd/0x1440
[ 35.084307] ima_file_check+0xb9/0x100
[ 35.088695] path_openat+0x7e4/0x2df0
[ 35.092991] do_filp_open+0x18c/0x3f0
[ 35.097287] do_sys_open+0x3b3/0x520
[ 35.101502] do_syscall_64+0xf9/0x620
[ 35.106566] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 35.112248]
[ 35.112248] other info that might help us debug this:
[ 35.112248]
[ 35.120376] Possible unsafe locking scenario:
[ 35.120376]
[ 35.126406] CPU0 CPU1
[ 35.131046] ---- ----
[ 35.135691] lock(&iint->mutex);
[ 35.139121] lock(sb_writers#3);
[ 35.145081] lock(&iint->mutex);
[ 35.151071] lock(sb_writers#3);
[ 35.154504]
[ 35.154504] *** DEADLOCK ***
[ 35.154504]
[ 35.160540] 1 lock held by syz-executor311/8106:
[ 35.165268] #0: 0000000043e7a252 (&iint->mutex){+.+.}, at: process_measurement+0x316/0x1440
[ 35.173830]
[ 35.173830] stack backtrace:
[ 35.178309] CPU: 0 PID: 8106 Comm: syz-executor311 Not tainted 4.19.211-syzkaller #0
[ 35.186953] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/26/2022
[ 35.196281] Call Trace:
[ 35.198856] dump_stack+0x1fc/0x2ef
[ 35.202463] print_circular_bug.constprop.0.cold+0x2d7/0x41e
[ 35.208255] __lock_acquire+0x30c9/0x3ff0
[ 35.212385] ? mark_held_locks+0xf0/0xf0
[ 35.216424] ? kmem_cache_alloc+0x122/0x370
[ 35.220721] ? mark_held_locks+0xf0/0xf0
[ 35.224763] ? path_openat+0x7e4/0x2df0
[ 35.228717] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 35.234060] ? fs_reclaim_release+0xd0/0x110
[ 35.238460] lock_acquire+0x170/0x3c0
[ 35.242238] ? mnt_want_write+0x3a/0xb0
[ 35.246192] __sb_start_write+0x6e/0x2a0
[ 35.250244] ? mnt_want_write+0x3a/0xb0
[ 35.254195] mnt_want_write+0x3a/0xb0
[ 35.257974] ovl_maybe_copy_up+0x11f/0x190
[ 35.262185] ovl_open+0xb4/0x260
[ 35.265527] do_dentry_open+0x4aa/0x1160
[ 35.269568] ? ovl_fsync+0x220/0x220
[ 35.273257] ? chown_common+0x550/0x550
[ 35.277229] ? percpu_counter_add_batch+0x126/0x180
[ 35.282223] dentry_open+0x132/0x1d0
[ 35.285917] ima_calc_file_hash+0x628/0x8a0
[ 35.290230] ? xattr_list_one+0x120/0x120
[ 35.294359] ima_collect_measurement+0x4c4/0x570
[ 35.299107] ? ima_get_action+0x90/0x90
[ 35.303077] ? ima_get_cache_status+0x1d0/0x1d0
[ 35.307728] process_measurement+0xddd/0x1440
[ 35.312216] ? ima_restore_measurement_entry+0x40/0x40
[ 35.317476] ? file_ra_state_init+0xc4/0x1e0
[ 35.321863] ? aa_get_task_label+0x1e6/0x7f0
[ 35.326255] ? lock_downgrade+0x720/0x720
[ 35.330397] ? check_preemption_disabled+0x41/0x280
[ 35.335392] ? check_preemption_disabled+0x41/0x280
[ 35.340390] ? aa_get_task_label+0x20d/0x7f0
[ 35.344775] ? revert_creds+0x32b/0x460
[ 35.348730] ? aa_capable+0xb80/0xb80
[ 35.352506] ? ovl_open+0xca/0x260
[ 35.356021] ? apparmor_task_getsecid+0x88/0xc0
[ 35.360665] ima_file_check+0xb9/0x100
[ 35.364530] ? process_measurement+0x1440/0x1440
[ 35.369263] ? inode_permission+0x3d/0x140
[ 35.373477] path_openat+0x7e4/0x2df0
[ 35.377260] ? path_lookupat+0x8d0/0x8d0
[ 35.381308] ? entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 35.386661] ? mark_held_locks+0xf0/0xf0
[ 35.390696] ? __lock_acquire+0x6de/0x3ff0
[ 35.394907] do_filp_open+0x18c/0x3f0
[ 35.398682] ? may_open_dev+0xf0/0xf0
[ 35.402459] ? lock_downgrade+0x720/0x720
[ 35.406585] ? lock_acquire+0x170/0x3c0
[ 35.410533] ? __alloc_fd+0x34/0x570
[ 35.414225] ? do_raw_spin_unlock+0x171/0x230
[ 35.418694] ? _raw_spin_unlock+0x29/0x40
[ 35.422826] ? __alloc_fd+0x28d/0x570
[ 35.426631] do_sys_open+0x3b3/0x520
[ 35.430328] ? filp_open+0x70/0x70
[ 35.433851] ? entry_SYSCALL_64_after_hwframe+0x3e/0xbe
[ 35.439195] ? trace_hardirqs_off_caller+0x6e/0x210
[ 35.444194] ? do_syscall_64+0x21/0x620
[ 35.448148] do_syscall_64+0xf9/0x620
[ 35.451928] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ 35.457099] RIP: 0033:0x7f5de31361a9
[ 35.460792] Code: 28 c3 e8 2a 14 00 00 66 2e 0f 1f 84 00 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
[ 35.479669] RSP: 002b:00007ffd44895778 EFLAGS: 00000246 ORIG_RAX: 0000000000000101
[ 35.487359] RAX: ffffffffffffffda RBX: 0030656c69662f2e RCX: 00007f5de31361a9
[ 35.494612] RDX: 0000000000000007 RSI: 00000000200001c0 RDI: 0000000000000003
[ 35.501867] RBP: 00007f5de30fa190 R08: 0000000000000000 R09: 0000000000000000
[ 35.509133] R10: 0000000000000000 R11: 0000000000000246 R12: 00007f5de30fa220
[ 35.516379] R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000