====================================================== WARNING: possible circular locking dependency detected 5.14.0-rc4-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor343/302 is trying to acquire lock: ffffffff8ce83d28 (brd_devices_mutex){+.+.}-{3:3}, at: brd_probe+0x30/0xe0 drivers/block/brd.c:431 but task is already holding lock: ffffffff8ccead28 (major_names_lock){+.+.}-{3:3}, at: blk_request_module+0x2f/0x1c0 block/genhd.c:657 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #3 (major_names_lock){+.+.}-{3:3}: lock_acquire+0x182/0x4a0 kernel/locking/lockdep.c:5625 __mutex_lock_common+0x1ad/0x3770 kernel/locking/mutex.c:959 __mutex_lock kernel/locking/mutex.c:1104 [inline] mutex_lock_nested+0x1a/0x20 kernel/locking/mutex.c:1119 __register_blkdev+0x2c/0x360 block/genhd.c:216 register_mtd_blktrans+0x94/0x3d0 drivers/mtd/mtd_blkdevs.c:531 do_one_initcall+0x197/0x3f0 init/main.c:1282 do_initcall_level+0x14a/0x1f5 init/main.c:1355 do_initcalls+0x4b/0x8c init/main.c:1371 kernel_init_freeable+0x3f1/0x57e init/main.c:1593 kernel_init+0x19/0x2a0 init/main.c:1485 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 -> #2 (mtd_table_mutex){+.+.}-{3:3}: lock_acquire+0x182/0x4a0 kernel/locking/lockdep.c:5625 __mutex_lock_common+0x1ad/0x3770 kernel/locking/mutex.c:959 __mutex_lock kernel/locking/mutex.c:1104 [inline] mutex_lock_nested+0x1a/0x20 kernel/locking/mutex.c:1119 blktrans_open+0x61/0x430 drivers/mtd/mtd_blkdevs.c:210 blkdev_get_whole+0x94/0x500 fs/block_dev.c:1253 blkdev_get_by_dev+0x339/0xdc0 fs/block_dev.c:1417 blkdev_open+0x132/0x2c0 fs/block_dev.c:1512 do_dentry_open+0x7cb/0x1020 fs/open.c:826 do_open fs/namei.c:3374 [inline] path_openat+0x27e7/0x36b0 fs/namei.c:3507 do_filp_open+0x253/0x4d0 fs/namei.c:3534 do_sys_openat2+0x124/0x460 fs/open.c:1204 do_sys_open fs/open.c:1220 [inline] __do_sys_open fs/open.c:1228 [inline] __se_sys_open fs/open.c:1224 [inline] __x64_sys_open+0x221/0x270 fs/open.c:1224 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae -> #1 (&disk->open_mutex){+.+.}-{3:3}: lock_acquire+0x182/0x4a0 kernel/locking/lockdep.c:5625 __mutex_lock_common+0x1ad/0x3770 kernel/locking/mutex.c:959 __mutex_lock kernel/locking/mutex.c:1104 [inline] mutex_lock_nested+0x1a/0x20 kernel/locking/mutex.c:1119 blkdev_get_by_dev+0x102/0xdc0 fs/block_dev.c:1410 disk_scan_partitions block/genhd.c:388 [inline] register_disk block/genhd.c:435 [inline] __device_add_disk+0x793/0xbd0 block/genhd.c:527 add_disk include/linux/genhd.h:217 [inline] brd_alloc+0x381/0x550 drivers/block/brd.c:416 brd_init+0x154/0x262 drivers/block/brd.c:499 do_one_initcall+0x197/0x3f0 init/main.c:1282 do_initcall_level+0x14a/0x1f5 init/main.c:1355 do_initcalls+0x4b/0x8c init/main.c:1371 kernel_init_freeable+0x3f1/0x57e init/main.c:1593 kernel_init+0x19/0x2a0 init/main.c:1485 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295 -> #0 (brd_devices_mutex){+.+.}-{3:3}: check_prev_add kernel/locking/lockdep.c:3051 [inline] check_prevs_add+0x4f9/0x5b30 kernel/locking/lockdep.c:3174 validate_chain kernel/locking/lockdep.c:3789 [inline] __lock_acquire+0x4476/0x6100 kernel/locking/lockdep.c:5015 lock_acquire+0x182/0x4a0 kernel/locking/lockdep.c:5625 __mutex_lock_common+0x1ad/0x3770 kernel/locking/mutex.c:959 __mutex_lock kernel/locking/mutex.c:1104 [inline] mutex_lock_nested+0x1a/0x20 kernel/locking/mutex.c:1119 brd_probe+0x30/0xe0 drivers/block/brd.c:431 blk_request_module+0x19d/0x1c0 block/genhd.c:660 blkdev_get_no_open+0x44/0x1f0 fs/block_dev.c:1334 blkdev_get_by_dev+0x89/0xdc0 fs/block_dev.c:1397 swsusp_check+0x3e/0x210 kernel/power/swap.c:1525 software_resume+0xc8/0x3d0 kernel/power/hibernate.c:977 resume_store+0xdc/0x120 kernel/power/hibernate.c:1179 kernfs_fop_write_iter+0x3b6/0x510 fs/kernfs/file.c:296 call_write_iter include/linux/fs.h:2114 [inline] new_sync_write fs/read_write.c:518 [inline] vfs_write+0xa39/0xc90 fs/read_write.c:605 ksys_write+0x171/0x2a0 fs/read_write.c:658 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae other info that might help us debug this: Chain exists of: brd_devices_mutex --> mtd_table_mutex --> major_names_lock Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(major_names_lock); lock(mtd_table_mutex); lock(major_names_lock); lock(brd_devices_mutex); *** DEADLOCK *** 5 locks held by syz-executor343/302: #0: ffff88802a58e460 (sb_writers#6){.+.+}-{0:0}, at: vfs_write+0x21b/0xc90 fs/read_write.c:601 #1: ffff8880175b0488 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1f3/0x510 fs/kernfs/file.c:287 #2: ffff8881445aca00 (kn->active#90){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x217/0x510 fs/kernfs/file.c:288 #3: ffffffff8c5d0ce8 (system_transition_mutex/1){+.+.}-{3:3}, at: software_resume+0x7a/0x3d0 kernel/power/hibernate.c:932 #4: ffffffff8ccead28 (major_names_lock){+.+.}-{3:3}, at: blk_request_module+0x2f/0x1c0 block/genhd.c:657 stack backtrace: CPU: 0 PID: 302 Comm: syz-executor343 Not tainted 5.14.0-rc4-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1ae/0x29f lib/dump_stack.c:105 print_circular_bug+0xb17/0xdc0 kernel/locking/lockdep.c:2009 check_noncircular+0x2cc/0x390 kernel/locking/lockdep.c:2131 check_prev_add kernel/locking/lockdep.c:3051 [inline] check_prevs_add+0x4f9/0x5b30 kernel/locking/lockdep.c:3174 validate_chain kernel/locking/lockdep.c:3789 [inline] __lock_acquire+0x4476/0x6100 kernel/locking/lockdep.c:5015 lock_acquire+0x182/0x4a0 kernel/locking/lockdep.c:5625 __mutex_lock_common+0x1ad/0x3770 kernel/locking/mutex.c:959 __mutex_lock kernel/locking/mutex.c:1104 [inline] mutex_lock_nested+0x1a/0x20 kernel/locking/mutex.c:1119 brd_probe+0x30/0xe0 drivers/block/brd.c:431 blk_request_module+0x19d/0x1c0 block/genhd.c:660 blkdev_get_no_open+0x44/0x1f0 fs/block_dev.c:1334 blkdev_get_by_dev+0x89/0xdc0 fs/block_dev.c:1397 swsusp_check+0x3e/0x210 kernel/power/swap.c:1525 software_resume+0xc8/0x3d0 kernel/power/hibernate.c:977 resume_store+0xdc/0x120 kernel/power/hibernate.c:1179 kernfs_fop_write_iter+0x3b6/0x510 fs/kernfs/file.c:296 call_write_iter include/linux/fs.h:2114 [inline] new_sync_write fs/read_write.c:518 [inline] vfs_write+0xa39/0xc90 fs/read_write.c:605 ksys_write+0x171/0x2a0 fs/read_write.c:658 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3d/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x43fe59 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 b1 14 00 00 90 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 RSP: 002b:00007ffc49f32968 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 0000000000089e99 RCX: 000000000043fe59 RDX: 0000000000000012 RSI: 0000000020000140 RDI: 0000000000000003 RBP: 0000000000000000 R08: 0000000000000012 R09: 00007ffc49f32b08 R10: 0000000000000000 R11: 0000000000000246 R12: 00007ffc49f3297c R13: 431bde82d7b634db R14: 00000000004ae018 R15: 0000000000400488 PM: Image not found (code -22)