Extracting prog: 2m13.366996034s Minimizing prog: 210.61µs Simplifying prog options: 0s Extracting C: 34.531878411s Simplifying C: 9m46.281738392s extracting reproducer from 16 programs first checking the prog from the crash report single: executing 1 programs separately with timeout 30s testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_mount_image$btrfs detailed listing: executing program 0: syz_mount_image$btrfs(&(0x7f00000055c0), &(0x7f0000000340)='./bus\x00', 0x8, &(0x7f0000000480)={[{@user_subvol_rm}, {@autodefrag}, {@ref_verify}, {@acl}, {@clear_cache}, {@discard}, 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program crashed: possible deadlock in btrfs_read_chunk_tree single: successfully extracted reproducer found reproducer with 1 syscalls minimizing guilty program extracting C reproducer testing compiled C program (duration=45.800293578s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_mount_image$btrfs program crashed: possible deadlock in btrfs_read_chunk_tree simplifying C reproducer testing compiled C program (duration=45.800293578s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_mount_image$btrfs program crashed: possible deadlock in btrfs_read_chunk_tree testing compiled C program (duration=45.800293578s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_mount_image$btrfs program crashed: possible deadlock in btrfs_read_chunk_tree testing compiled C program (duration=45.800293578s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:true Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_mount_image$btrfs program crashed: possible deadlock in btrfs_read_chunk_tree testing compiled C program (duration=45.800293578s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_mount_image$btrfs program crashed: possible deadlock in btrfs_read_chunk_tree testing compiled C program (duration=45.800293578s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:true Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_mount_image$btrfs program crashed: possible deadlock in btrfs_read_chunk_tree testing compiled C program (duration=45.800293578s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:false Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_mount_image$btrfs program crashed: possible deadlock in btrfs_read_chunk_tree testing compiled C program (duration=45.800293578s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_mount_image$btrfs program crashed: possible deadlock in btrfs_read_chunk_tree reproducing took 12m34.180859342s repro crashed as (corrupted=false): BTRFS info (device loop0): first mount of filesystem ed167579-eb65-4e76-9a50-61ac97e9b59d BTRFS info (device loop0): using sha256 (sha256-x86_64) checksum algorithm BTRFS info (device loop0): using free-space-tree ====================================================== WARNING: possible circular locking dependency detected 6.16.0-rc2-next-20250620-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor338/5831 is trying to acquire lock: ffffffff8e6e9fe8 (uuid_mutex){+.+.}-{4:4}, at: btrfs_read_chunk_tree+0xef/0x2170 fs/btrfs/volumes.c:7462 but task is already holding lock: ffff888031b5e0e0 (&type->s_umount_key#41/1){+.+.}-{4:4}, at: alloc_super+0x204/0x970 fs/super.c:345 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&type->s_umount_key#41/1){+.+.}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871 down_write_nested+0x9d/0x200 kernel/locking/rwsem.c:1693 alloc_super+0x204/0x970 fs/super.c:345 sget_fc+0x329/0xa40 fs/super.c:761 btrfs_get_tree_super fs/btrfs/super.c:1867 [inline] btrfs_get_tree_subvol fs/btrfs/super.c:2059 [inline] btrfs_get_tree+0x4c6/0x12d0 fs/btrfs/super.c:2093 vfs_get_tree+0x8f/0x2b0 fs/super.c:1804 do_new_mount+0x24a/0xa40 fs/namespace.c:3902 do_mount fs/namespace.c:4239 [inline] __do_sys_mount fs/namespace.c:4450 [inline] __se_sys_mount+0x317/0x410 fs/namespace.c:4427 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (uuid_mutex){+.+.}-{4:4}: check_prev_add kernel/locking/lockdep.c:3168 [inline] check_prevs_add kernel/locking/lockdep.c:3287 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3911 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5240 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871 __mutex_lock_common kernel/locking/mutex.c:602 [inline] __mutex_lock+0x182/0xe80 kernel/locking/mutex.c:747 btrfs_read_chunk_tree+0xef/0x2170 fs/btrfs/volumes.c:7462 open_ctree+0x17f2/0x3a10 fs/btrfs/disk-io.c:3458 btrfs_fill_super fs/btrfs/super.c:984 [inline] btrfs_get_tree_super fs/btrfs/super.c:1922 [inline] btrfs_get_tree_subvol fs/btrfs/super.c:2059 [inline] btrfs_get_tree+0xc6f/0x12d0 fs/btrfs/super.c:2093 vfs_get_tree+0x8f/0x2b0 fs/super.c:1804 do_new_mount+0x24a/0xa40 fs/namespace.c:3902 do_mount fs/namespace.c:4239 [inline] __do_sys_mount fs/namespace.c:4450 [inline] __se_sys_mount+0x317/0x410 fs/namespace.c:4427 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&type->s_umount_key#41/1); lock(uuid_mutex); lock(&type->s_umount_key#41/1); lock(uuid_mutex); *** DEADLOCK *** 1 lock held by syz-executor338/5831: #0: ffff888031b5e0e0 (&type->s_umount_key#41/1){+.+.}-{4:4}, at: alloc_super+0x204/0x970 fs/super.c:345 stack backtrace: CPU: 0 UID: 0 PID: 5831 Comm: syz-executor338 Not tainted 6.16.0-rc2-next-20250620-syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_circular_bug+0x2ee/0x310 kernel/locking/lockdep.c:2046 check_noncircular+0x134/0x160 kernel/locking/lockdep.c:2178 check_prev_add kernel/locking/lockdep.c:3168 [inline] check_prevs_add kernel/locking/lockdep.c:3287 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3911 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5240 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871 __mutex_lock_common kernel/locking/mutex.c:602 [inline] __mutex_lock+0x182/0xe80 kernel/locking/mutex.c:747 btrfs_read_chunk_tree+0xef/0x2170 fs/btrfs/volumes.c:7462 open_ctree+0x17f2/0x3a10 fs/btrfs/disk-io.c:3458 btrfs_fill_super fs/btrfs/super.c:984 [inline] btrfs_get_tree_super fs/btrfs/super.c:1922 [inline] btrfs_get_tree_subvol fs/btrfs/super.c:2059 [inline] btrfs_get_tree+0xc6f/0x12d0 fs/btrfs/super.c:2093 vfs_get_tree+0x8f/0x2b0 fs/super.c:1804 do_new_mount+0x24a/0xa40 fs/namespace.c:3902 do_mount fs/namespace.c:4239 [inline] __do_sys_mount fs/namespace.c:4450 [inline] __se_sys_mount+0x317/0x410 fs/namespace.c:4427 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f1b48a65cfa Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 5e 04 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff004051f8 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fff00405210 RCX: 00007f1b48a65cfa RDX: 00002000000055c0 RSI: 0000200000000340 RDI: 00007fff00405210 RBP: 0000200000000340 R08: 00007fff final repro crashed as (corrupted=false): BTRFS info (device loop0): first mount of filesystem ed167579-eb65-4e76-9a50-61ac97e9b59d BTRFS info (device loop0): using sha256 (sha256-x86_64) checksum algorithm BTRFS info (device loop0): using free-space-tree ====================================================== WARNING: possible circular locking dependency detected 6.16.0-rc2-next-20250620-syzkaller #0 Not tainted ------------------------------------------------------ syz-executor338/5831 is trying to acquire lock: ffffffff8e6e9fe8 (uuid_mutex){+.+.}-{4:4}, at: btrfs_read_chunk_tree+0xef/0x2170 fs/btrfs/volumes.c:7462 but task is already holding lock: ffff888031b5e0e0 (&type->s_umount_key#41/1){+.+.}-{4:4}, at: alloc_super+0x204/0x970 fs/super.c:345 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #1 (&type->s_umount_key#41/1){+.+.}-{4:4}: lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871 down_write_nested+0x9d/0x200 kernel/locking/rwsem.c:1693 alloc_super+0x204/0x970 fs/super.c:345 sget_fc+0x329/0xa40 fs/super.c:761 btrfs_get_tree_super fs/btrfs/super.c:1867 [inline] btrfs_get_tree_subvol fs/btrfs/super.c:2059 [inline] btrfs_get_tree+0x4c6/0x12d0 fs/btrfs/super.c:2093 vfs_get_tree+0x8f/0x2b0 fs/super.c:1804 do_new_mount+0x24a/0xa40 fs/namespace.c:3902 do_mount fs/namespace.c:4239 [inline] __do_sys_mount fs/namespace.c:4450 [inline] __se_sys_mount+0x317/0x410 fs/namespace.c:4427 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f -> #0 (uuid_mutex){+.+.}-{4:4}: check_prev_add kernel/locking/lockdep.c:3168 [inline] check_prevs_add kernel/locking/lockdep.c:3287 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3911 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5240 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871 __mutex_lock_common kernel/locking/mutex.c:602 [inline] __mutex_lock+0x182/0xe80 kernel/locking/mutex.c:747 btrfs_read_chunk_tree+0xef/0x2170 fs/btrfs/volumes.c:7462 open_ctree+0x17f2/0x3a10 fs/btrfs/disk-io.c:3458 btrfs_fill_super fs/btrfs/super.c:984 [inline] btrfs_get_tree_super fs/btrfs/super.c:1922 [inline] btrfs_get_tree_subvol fs/btrfs/super.c:2059 [inline] btrfs_get_tree+0xc6f/0x12d0 fs/btrfs/super.c:2093 vfs_get_tree+0x8f/0x2b0 fs/super.c:1804 do_new_mount+0x24a/0xa40 fs/namespace.c:3902 do_mount fs/namespace.c:4239 [inline] __do_sys_mount fs/namespace.c:4450 [inline] __se_sys_mount+0x317/0x410 fs/namespace.c:4427 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f other info that might help us debug this: Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(&type->s_umount_key#41/1); lock(uuid_mutex); lock(&type->s_umount_key#41/1); lock(uuid_mutex); *** DEADLOCK *** 1 lock held by syz-executor338/5831: #0: ffff888031b5e0e0 (&type->s_umount_key#41/1){+.+.}-{4:4}, at: alloc_super+0x204/0x970 fs/super.c:345 stack backtrace: CPU: 0 UID: 0 PID: 5831 Comm: syz-executor338 Not tainted 6.16.0-rc2-next-20250620-syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 print_circular_bug+0x2ee/0x310 kernel/locking/lockdep.c:2046 check_noncircular+0x134/0x160 kernel/locking/lockdep.c:2178 check_prev_add kernel/locking/lockdep.c:3168 [inline] check_prevs_add kernel/locking/lockdep.c:3287 [inline] validate_chain+0xb9b/0x2140 kernel/locking/lockdep.c:3911 __lock_acquire+0xab9/0xd20 kernel/locking/lockdep.c:5240 lock_acquire+0x120/0x360 kernel/locking/lockdep.c:5871 __mutex_lock_common kernel/locking/mutex.c:602 [inline] __mutex_lock+0x182/0xe80 kernel/locking/mutex.c:747 btrfs_read_chunk_tree+0xef/0x2170 fs/btrfs/volumes.c:7462 open_ctree+0x17f2/0x3a10 fs/btrfs/disk-io.c:3458 btrfs_fill_super fs/btrfs/super.c:984 [inline] btrfs_get_tree_super fs/btrfs/super.c:1922 [inline] btrfs_get_tree_subvol fs/btrfs/super.c:2059 [inline] btrfs_get_tree+0xc6f/0x12d0 fs/btrfs/super.c:2093 vfs_get_tree+0x8f/0x2b0 fs/super.c:1804 do_new_mount+0x24a/0xa40 fs/namespace.c:3902 do_mount fs/namespace.c:4239 [inline] __do_sys_mount fs/namespace.c:4450 [inline] __se_sys_mount+0x317/0x410 fs/namespace.c:4427 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xfa/0x3b0 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f1b48a65cfa Code: d8 64 89 02 48 c7 c0 ff ff ff ff eb a6 e8 5e 04 00 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff004051f8 EFLAGS: 00000282 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007fff00405210 RCX: 00007f1b48a65cfa RDX: 00002000000055c0 RSI: 0000200000000340 RDI: 00007fff00405210 RBP: 0000200000000340 R08: 00007fff