Warning: Permanently added '10.128.0.150' (ECDSA) to the list of known hosts. executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program syzkaller login: [ 58.303094][ T8740] [ 58.305621][ T8740] ====================================================== [ 58.312703][ T8740] WARNING: possible circular locking dependency detected [ 58.319694][ T8740] 5.13.0-syzkaller #0 Not tainted [ 58.324864][ T8740] ------------------------------------------------------ [ 58.331853][ T8740] systemd-udevd/8740 is trying to acquire lock: [ 58.338061][ T8740] ffffffff8cc7c968 (loop_ctl_mutex){+.+.}-{3:3}, at: loop_probe+0xc7/0x150 [ 58.346835][ T8740] [ 58.346835][ T8740] but task is already holding lock: [ 58.354323][ T8740] ffffffff8c9e9ba8 (major_names_lock){+.+.}-{3:3}, at: blk_request_module+0x25/0x1d0 [ 58.363948][ T8740] [ 58.363948][ T8740] which lock already depends on the new lock. [ 58.363948][ T8740] [ 58.374834][ T8740] [ 58.374834][ T8740] the existing dependency chain (in reverse order) is: [ 58.383991][ T8740] [ 58.383991][ T8740] -> #3 (major_names_lock){+.+.}-{3:3}: [ 58.391866][ T8740] __mutex_lock+0x12a/0x10a0 [ 58.397142][ T8740] __register_blkdev+0x2b/0x3e0 [ 58.402493][ T8740] register_mtd_blktrans+0x85/0x3c0 [ 58.408200][ T8740] do_one_initcall+0x103/0x650 [ 58.413690][ T8740] kernel_init_freeable+0x6b8/0x741 [ 58.419559][ T8740] kernel_init+0x1a/0x1d0 [ 58.424390][ T8740] ret_from_fork+0x1f/0x30 [ 58.429570][ T8740] [ 58.429570][ T8740] -> #2 (mtd_table_mutex){+.+.}-{3:3}: [ 58.437279][ T8740] __mutex_lock+0x12a/0x10a0 [ 58.442367][ T8740] blktrans_open+0x69/0x600 [ 58.447383][ T8740] blkdev_get_whole+0xa1/0x420 [ 58.452645][ T8740] blkdev_get_by_dev.part.0+0x30c/0xdd0 [ 58.458777][ T8740] blkdev_open+0x295/0x300 [ 58.463779][ T8740] do_dentry_open+0x4c8/0x11c0 [ 58.469039][ T8740] path_openat+0x1c0e/0x27e0 [ 58.474127][ T8740] do_filp_open+0x190/0x3d0 [ 58.479128][ T8740] do_sys_openat2+0x16d/0x420 [ 58.484301][ T8740] __x64_sys_open+0x119/0x1c0 [ 58.489476][ T8740] do_syscall_64+0x35/0xb0 [ 58.494477][ T8740] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 58.500870][ T8740] [ 58.500870][ T8740] -> #1 (&disk->open_mutex){+.+.}-{3:3}: [ 58.508885][ T8740] __mutex_lock+0x12a/0x10a0 [ 58.514165][ T8740] del_gendisk+0x8b/0x770 [ 58.519172][ T8740] loop_control_ioctl+0x3e7/0x480 [ 58.525248][ T8740] __x64_sys_ioctl+0x193/0x200 [ 58.530515][ T8740] do_syscall_64+0x35/0xb0 [ 58.535616][ T8740] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 58.542071][ T8740] [ 58.542071][ T8740] -> #0 (loop_ctl_mutex){+.+.}-{3:3}: [ 58.549646][ T8740] __lock_acquire+0x2a07/0x54a0 [ 58.554996][ T8740] lock_acquire+0x1ab/0x510 [ 58.559999][ T8740] __mutex_lock+0x12a/0x10a0 [ 58.565092][ T8740] loop_probe+0xc7/0x150 [ 58.569842][ T8740] blk_request_module+0x111/0x1d0 [ 58.575367][ T8740] blkdev_get_no_open+0x1d5/0x250 [ 58.580893][ T8740] blkdev_get_by_dev.part.0+0x25/0xdd0 [ 58.586852][ T8740] blkdev_open+0x295/0x300 [ 58.591784][ T8740] do_dentry_open+0x4c8/0x11c0 [ 58.597048][ T8740] path_openat+0x1c0e/0x27e0 [ 58.602137][ T8740] do_filp_open+0x190/0x3d0 [ 58.607149][ T8740] do_sys_openat2+0x16d/0x420 [ 58.612328][ T8740] __x64_sys_open+0x119/0x1c0 [ 58.617671][ T8740] do_syscall_64+0x35/0xb0 [ 58.622586][ T8740] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 58.629160][ T8740] [ 58.629160][ T8740] other info that might help us debug this: [ 58.629160][ T8740] [ 58.639898][ T8740] Chain exists of: [ 58.639898][ T8740] loop_ctl_mutex --> mtd_table_mutex --> major_names_lock [ 58.639898][ T8740] [ 58.652904][ T8740] Possible unsafe locking scenario: [ 58.652904][ T8740] [ 58.660414][ T8740] CPU0 CPU1 [ 58.665750][ T8740] ---- ---- [ 58.671089][ T8740] lock(major_names_lock); [ 58.675568][ T8740] lock(mtd_table_mutex); [ 58.682479][ T8740] lock(major_names_lock); [ 58.689473][ T8740] lock(loop_ctl_mutex); [ 58.693778][ T8740] [ 58.693778][ T8740] *** DEADLOCK *** [ 58.693778][ T8740] [ 58.702440][ T8740] 1 lock held by systemd-udevd/8740: [ 58.707889][ T8740] #0: ffffffff8c9e9ba8 (major_names_lock){+.+.}-{3:3}, at: blk_request_module+0x25/0x1d0 [ 58.717963][ T8740] [ 58.717963][ T8740] stack backtrace: [ 58.723881][ T8740] CPU: 0 PID: 8740 Comm: systemd-udevd Not tainted 5.13.0-syzkaller #0 [ 58.732116][ T8740] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 [ 58.742174][ T8740] Call Trace: [ 58.745436][ T8740] dump_stack_lvl+0xcd/0x134 [ 58.750447][ T8740] check_noncircular+0x25f/0x2e0 [ 58.755541][ T8740] ? print_circular_bug+0x1e0/0x1e0 [ 58.760893][ T8740] ? mark_lock+0xef/0x17b0 [ 58.765486][ T8740] ? kasan_save_stack+0x32/0x40 [ 58.770318][ T8740] ? kasan_save_stack+0x1b/0x40 [ 58.775149][ T8740] ? lockdep_lock+0xc6/0x200 [ 58.779764][ T8740] ? call_rcu_zapped+0xb0/0xb0 [ 58.784611][ T8740] ? do_filp_open+0x190/0x3d0 [ 58.789368][ T8740] ? __x64_sys_open+0x119/0x1c0 [ 58.794200][ T8740] __lock_acquire+0x2a07/0x54a0 [ 58.799049][ T8740] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 58.805010][ T8740] lock_acquire+0x1ab/0x510 [ 58.809495][ T8740] ? loop_probe+0xc7/0x150 [ 58.813979][ T8740] ? lock_release+0x720/0x720 [ 58.818655][ T8740] __mutex_lock+0x12a/0x10a0 [ 58.823227][ T8740] ? loop_probe+0xc7/0x150 [ 58.827711][ T8740] ? loop_probe+0xc7/0x150 [ 58.832120][ T8740] ? mutex_lock_io_nested+0xf00/0xf00 [ 58.837471][ T8740] ? __mutex_lock+0x5bf/0x10a0 [ 58.842221][ T8740] ? find_held_lock+0x2d/0x110 [ 58.846984][ T8740] ? blk_request_module+0x25/0x1d0 [ 58.852079][ T8740] ? ilookup+0xb3/0x230 [ 58.856234][ T8740] loop_probe+0xc7/0x150 [ 58.860470][ T8740] ? loop_control_ioctl+0x480/0x480 [ 58.865651][ T8740] ? find_inode_fast+0x16f/0x220 [ 58.870568][ T8740] ? do_raw_spin_unlock+0x171/0x230 [ 58.875747][ T8740] ? loop_control_ioctl+0x480/0x480 [ 58.880946][ T8740] blk_request_module+0x111/0x1d0 [ 58.886148][ T8740] blkdev_get_no_open+0x1d5/0x250 [ 58.891155][ T8740] blkdev_get_by_dev.part.0+0x25/0xdd0 [ 58.896595][ T8740] ? devcgroup_check_permission+0x1a8/0x420 [ 58.902466][ T8740] blkdev_open+0x295/0x300 [ 58.906864][ T8740] do_dentry_open+0x4c8/0x11c0 [ 58.911623][ T8740] ? blkdev_get_by_dev+0x80/0x80 [ 58.916542][ T8740] ? __sanitizer_cov_trace_const_cmp4+0x1c/0x70 [ 58.922766][ T8740] ? may_open+0x1f6/0x420 [ 58.927084][ T8740] path_openat+0x1c0e/0x27e0 [ 58.931656][ T8740] ? path_lookupat+0x850/0x850 [ 58.936402][ T8740] ? lockdep_hardirqs_on_prepare+0x400/0x400 [ 58.942361][ T8740] do_filp_open+0x190/0x3d0 [ 58.946946][ T8740] ? may_open_dev+0xf0/0xf0 [ 58.951431][ T8740] ? do_raw_spin_lock+0x120/0x2b0 [ 58.956435][ T8740] ? rwlock_bug.part.0+0x90/0x90 [ 58.961348][ T8740] ? __sanitizer_cov_trace_const_cmp8+0x1d/0x70 [ 58.967567][ T8740] ? _find_next_bit+0x1e3/0x260 [ 58.972399][ T8740] ? _raw_spin_unlock+0x24/0x40 [ 58.977316][ T8740] ? alloc_fd+0x2e6/0x660 [ 58.981625][ T8740] do_sys_openat2+0x16d/0x420 [ 58.986298][ T8740] ? build_open_flags+0x6f0/0x6f0 [ 58.991388][ T8740] ? __context_tracking_exit+0xb8/0xe0 [ 58.997022][ T8740] __x64_sys_open+0x119/0x1c0 [ 59.001679][ T8740] ? do_sys_open+0x140/0x140 [ 59.006455][ T8740] ? __secure_computing+0x104/0x360 [ 59.011753][ T8740] do_syscall_64+0x35/0xb0 [ 59.016150][ T8740] entry_SYSCALL_64_after_hwframe+0x44/0xae [ 59.022028][ T8740] RIP: 0033:0x7f8f34e56840 [ 59.026431][ T8740] Code: 73 01 c3 48 8b 0d 68 77 20 00 f7 d8 64 89 01 48 83 c8 ff c3 66 0f 1f 44 00 00 83 3d 89 bb 20 00 00 75 10 b8 02 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 31 c3 48 83 ec 08 e8 1e f6 ff ff 48 89 04 24 [ 59.046019][ T8740] RSP: 002b:00007ffcd8c5a778 EFLAGS: 00000246 ORIG_RAX: 0000000000000002 [ 59.054408][ T8740] RAX: ffffffffffffffda RBX: 00005615b087e810 RCX: 00007f8f34e56840 [ 59.062457][ T8740] RDX: 00005615b06c1fe3 RSI: 00000000000a0800 RDI: 00005615b08831b0 [ 59.070666][ T8740] RBP: 00007ffcd8c5a8f0 R08: 00005615b06c1670 R09: 0000000000000010 [ 59.079136][ T8740] R10: 00007f8f34bd0d70 R11: 0000000000000246 R12: 00007ffcd8c5a840 [ 59.087258][ T8740] R13: 00005615b0884e10 R14: 0000000000000003 R15: 000000000000000e executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program executing program 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