Extracting prog: 3m9.718572933s Minimizing prog: 7m2.058416159s Simplifying prog options: 0s Extracting C: 1m58.410535965s Simplifying C: 7m59.853499271s extracting reproducer from 24 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:4 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}}): openat$auto_configfs_file_operations_configfs_internal-write$auto-write$auto detailed listing: executing program 0: r0 = openat$auto_configfs_file_operations_configfs_internal(0xffffffffffffff9c, &(0x7f0000006900)='/sys/kernel/config/target/dbroot\x00', 0x189002, 0x0) write$auto(r0, &(0x7f0000000040)='/sys/kernel/config/target/dbroot\x00', 0x6e) write$auto(r0, &(0x7f0000000000)='/dev/audio1\x00', 0x4) program crashed: possible deadlock in __configfs_open_file single: successfully extracted reproducer found reproducer with 3 syscalls minimizing guilty program testing program (duration=45.251201707s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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}}): openat$auto_configfs_file_operations_configfs_internal-write$auto detailed listing: executing program 0: r0 = openat$auto_configfs_file_operations_configfs_internal(0xffffffffffffff9c, &(0x7f0000006900)='/sys/kernel/config/target/dbroot\x00', 0x189002, 0x0) write$auto(r0, &(0x7f0000000040)='/sys/kernel/config/target/dbroot\x00', 0x6e) program crashed: possible deadlock in __configfs_open_file testing program (duration=45.251201707s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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}}): openat$auto_configfs_file_operations_configfs_internal detailed listing: executing program 0: openat$auto_configfs_file_operations_configfs_internal(0xffffffffffffff9c, &(0x7f0000006900)='/sys/kernel/config/target/dbroot\x00', 0x189002, 0x0) program did not crash testing program (duration=45.251201707s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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}}): write$auto detailed listing: executing program 0: write$auto(0xffffffffffffffff, &(0x7f0000000040)='/sys/kernel/config/target/dbroot\x00', 0x6e) program did not crash testing program (duration=45.251201707s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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}}): openat$auto_configfs_file_operations_configfs_internal-write$auto detailed listing: executing program 0: r0 = openat$auto_configfs_file_operations_configfs_internal(0xffffffffffffff9c, 0x0, 0x189002, 0x0) write$auto(r0, &(0x7f0000000040)='/sys/kernel/config/target/dbroot\x00', 0x6e) program did not crash testing program (duration=45.251201707s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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}}): openat$auto_configfs_file_operations_configfs_internal-write$auto detailed listing: executing program 0: r0 = openat$auto_configfs_file_operations_configfs_internal(0xffffffffffffff9c, &(0x7f0000006900)='/sys/kernel/config/target/dbroot\x00', 0x189002, 0x0) write$auto(r0, 0x0, 0x6e) program did not crash extracting C reproducer testing compiled C program (duration=45.251201707s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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}}): openat$auto_configfs_file_operations_configfs_internal-write$auto program crashed: possible deadlock in __configfs_open_file simplifying C reproducer testing compiled C program (duration=45.251201707s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 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}}): openat$auto_configfs_file_operations_configfs_internal-write$auto program crashed: possible deadlock in __configfs_open_file testing compiled C program (duration=45.251201707s, {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}}): openat$auto_configfs_file_operations_configfs_internal-write$auto program crashed: possible deadlock in __configfs_open_file testing compiled C program (duration=45.251201707s, {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}}): openat$auto_configfs_file_operations_configfs_internal-write$auto program crashed: possible deadlock in __configfs_open_file testing compiled C program (duration=45.251201707s, {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}}): openat$auto_configfs_file_operations_configfs_internal-write$auto program crashed: possible deadlock in __configfs_open_file testing compiled C program (duration=45.251201707s, {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}}): openat$auto_configfs_file_operations_configfs_internal-write$auto program crashed: possible deadlock in __configfs_open_file testing compiled C program (duration=45.251201707s, {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}}): openat$auto_configfs_file_operations_configfs_internal-write$auto program crashed: possible deadlock in __configfs_open_file testing compiled C program (duration=45.251201707s, {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}}): openat$auto_configfs_file_operations_configfs_internal-write$auto program crashed: possible deadlock in __configfs_open_file reproducing took 20m10.041052097s repro crashed as (corrupted=false): ============================================ WARNING: possible recursive locking detected 6.15.0-syzkaller-11061-g7f9039c524a3 #0 Not tainted -------------------------------------------- syz-executor146/5830 is trying to acquire lock: ffff888142b5c578 (&p->frag_sem){.+.+}-{4:4}, at: __configfs_open_file+0xe8/0x9c0 fs/configfs/file.c:304 but task is already holding lock: ffff888142b5c578 (&p->frag_sem){.+.+}-{4:4}, at: flush_write_buffer fs/configfs/file.c:205 [inline] ffff888142b5c578 (&p->frag_sem){.+.+}-{4:4}, at: configfs_write_iter+0x219/0x4e0 fs/configfs/file.c:229 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&p->frag_sem); lock(&p->frag_sem); *** DEADLOCK *** May be due to missing lock nesting notation 4 locks held by syz-executor146/5830: #0: ffff888145ea2428 (sb_writers#8){.+.+}-{0:0}, at: ksys_write+0x12a/0x250 fs/read_write.c:738 #1: ffff8880344c4c88 (&buffer->mutex){+.+.}-{4:4}, at: configfs_write_iter+0x75/0x4e0 fs/configfs/file.c:226 #2: ffff888142b5c578 (&p->frag_sem){.+.+}-{4:4}, at: flush_write_buffer fs/configfs/file.c:205 [inline] #2: ffff888142b5c578 (&p->frag_sem){.+.+}-{4:4}, at: configfs_write_iter+0x219/0x4e0 fs/configfs/file.c:229 #3: ffffffff8f474d28 (target_devices_lock){+.+.}-{4:4}, at: target_core_item_dbroot_store+0x21/0x350 drivers/target/target_core_configfs.c:114 stack backtrace: CPU: 1 UID: 0 PID: 5830 Comm: syz-executor146 Not tainted 6.15.0-syzkaller-11061-g7f9039c524a3 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_deadlock_bug+0x1e9/0x240 kernel/locking/lockdep.c:3044 check_deadlock kernel/locking/lockdep.c:3096 [inline] validate_chain kernel/locking/lockdep.c:3898 [inline] __lock_acquire+0x1106/0x1c90 kernel/locking/lockdep.c:5240 lock_acquire kernel/locking/lockdep.c:5871 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5828 down_read+0x9b/0x480 kernel/locking/rwsem.c:1524 __configfs_open_file+0xe8/0x9c0 fs/configfs/file.c:304 do_dentry_open+0x744/0x1c10 fs/open.c:964 vfs_open+0x82/0x3f0 fs/open.c:1094 do_open fs/namei.c:3887 [inline] path_openat+0x1de4/0x2cb0 fs/namei.c:4046 do_filp_open+0x20b/0x470 fs/namei.c:4073 file_open_name+0x2a3/0x450 fs/open.c:1381 filp_open+0x4b/0x80 fs/open.c:1401 target_core_item_dbroot_store+0x108/0x350 drivers/target/target_core_configfs.c:134 flush_write_buffer fs/configfs/file.c:207 [inline] configfs_write_iter+0x306/0x4e0 fs/configfs/file.c:229 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x6c4/0x1150 fs/read_write.c:686 ksys_write+0x12a/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x490 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fdf731bb329 Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff2f69ab28 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fff2f69acf8 RCX: 00007fdf731bb329 RDX: 000000000000006e RSI: 0000200000000040 RDI: 0000000000000003 RBP: 00007fdf7322e610 R08: 0000000000000000 R09: 00007fff2f69acf8 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007fff2f69ace8 R14: 0000000000000001 R15: 0000000000000001 db_root: not a directory: /sys/kernel/config/target/dbroot final repro crashed as (corrupted=false): ============================================ WARNING: possible recursive locking detected 6.15.0-syzkaller-11061-g7f9039c524a3 #0 Not tainted -------------------------------------------- syz-executor146/5830 is trying to acquire lock: ffff888142b5c578 (&p->frag_sem){.+.+}-{4:4}, at: __configfs_open_file+0xe8/0x9c0 fs/configfs/file.c:304 but task is already holding lock: ffff888142b5c578 (&p->frag_sem){.+.+}-{4:4}, at: flush_write_buffer fs/configfs/file.c:205 [inline] ffff888142b5c578 (&p->frag_sem){.+.+}-{4:4}, at: configfs_write_iter+0x219/0x4e0 fs/configfs/file.c:229 other info that might help us debug this: Possible unsafe locking scenario: CPU0 ---- lock(&p->frag_sem); lock(&p->frag_sem); *** DEADLOCK *** May be due to missing lock nesting notation 4 locks held by syz-executor146/5830: #0: ffff888145ea2428 (sb_writers#8){.+.+}-{0:0}, at: ksys_write+0x12a/0x250 fs/read_write.c:738 #1: ffff8880344c4c88 (&buffer->mutex){+.+.}-{4:4}, at: configfs_write_iter+0x75/0x4e0 fs/configfs/file.c:226 #2: ffff888142b5c578 (&p->frag_sem){.+.+}-{4:4}, at: flush_write_buffer fs/configfs/file.c:205 [inline] #2: ffff888142b5c578 (&p->frag_sem){.+.+}-{4:4}, at: configfs_write_iter+0x219/0x4e0 fs/configfs/file.c:229 #3: ffffffff8f474d28 (target_devices_lock){+.+.}-{4:4}, at: target_core_item_dbroot_store+0x21/0x350 drivers/target/target_core_configfs.c:114 stack backtrace: CPU: 1 UID: 0 PID: 5830 Comm: syz-executor146 Not tainted 6.15.0-syzkaller-11061-g7f9039c524a3 #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025 Call Trace: __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120 print_deadlock_bug+0x1e9/0x240 kernel/locking/lockdep.c:3044 check_deadlock kernel/locking/lockdep.c:3096 [inline] validate_chain kernel/locking/lockdep.c:3898 [inline] __lock_acquire+0x1106/0x1c90 kernel/locking/lockdep.c:5240 lock_acquire kernel/locking/lockdep.c:5871 [inline] lock_acquire+0x179/0x350 kernel/locking/lockdep.c:5828 down_read+0x9b/0x480 kernel/locking/rwsem.c:1524 __configfs_open_file+0xe8/0x9c0 fs/configfs/file.c:304 do_dentry_open+0x744/0x1c10 fs/open.c:964 vfs_open+0x82/0x3f0 fs/open.c:1094 do_open fs/namei.c:3887 [inline] path_openat+0x1de4/0x2cb0 fs/namei.c:4046 do_filp_open+0x20b/0x470 fs/namei.c:4073 file_open_name+0x2a3/0x450 fs/open.c:1381 filp_open+0x4b/0x80 fs/open.c:1401 target_core_item_dbroot_store+0x108/0x350 drivers/target/target_core_configfs.c:134 flush_write_buffer fs/configfs/file.c:207 [inline] configfs_write_iter+0x306/0x4e0 fs/configfs/file.c:229 new_sync_write fs/read_write.c:593 [inline] vfs_write+0x6c4/0x1150 fs/read_write.c:686 ksys_write+0x12a/0x250 fs/read_write.c:738 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline] do_syscall_64+0xcd/0x490 arch/x86/entry/syscall_64.c:94 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7fdf731bb329 Code: 48 83 c4 28 c3 e8 37 17 00 00 0f 1f 80 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 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff2f69ab28 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fff2f69acf8 RCX: 00007fdf731bb329 RDX: 000000000000006e RSI: 0000200000000040 RDI: 0000000000000003 RBP: 00007fdf7322e610 R08: 0000000000000000 R09: 00007fff2f69acf8 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000001 R13: 00007fff2f69ace8 R14: 0000000000000001 R15: 0000000000000001 db_root: not a directory: /sys/kernel/config/target/dbroot