INFO: task syz.0.36:6166 blocked for more than 143 seconds. Not tainted 6.16.0-rc1-syzkaller-g27605c8c0f69 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.36 state:D stack:23880 pid:6166 tgid:6165 ppid:5878 task_flags:0x400140 flags:0x00004006 Call Trace: context_switch kernel/sched/core.c:5396 [inline] __schedule+0x16f5/0x4d00 kernel/sched/core.c:6785 __schedule_loop kernel/sched/core.c:6863 [inline] schedule+0x165/0x360 kernel/sched/core.c:6878 schedule_timeout+0x9a/0x270 kernel/time/sleep_timeout.c:75 ___down_common kernel/locking/semaphore.c:268 [inline] __down_common+0x319/0x6a0 kernel/locking/semaphore.c:293 down+0x80/0xd0 kernel/locking/semaphore.c:100 console_lock+0x145/0x1b0 kernel/printk/printk.c:2849 bch2_print_string_as_lines+0x54/0x280 fs/bcachefs/util.c:277 bch2_fs_recovery+0x1097/0x39a0 fs/bcachefs/recovery.c:1117 bch2_fs_start+0xa99/0xd90 fs/bcachefs/super.c:1200 bch2_fs_get_tree+0xb6c/0x1460 fs/bcachefs/fs.c:2489 vfs_get_tree+0x92/0x2b0 fs/super.c:1802 do_new_mount+0x24a/0xa40 fs/namespace.c:3885 do_mount fs/namespace.c:4222 [inline] __do_sys_mount fs/namespace.c:4433 [inline] __se_sys_mount+0x317/0x410 fs/namespace.c:4410 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: 0033:0x7f1df618e90a RSP: 002b:00007f1df53fde68 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5 RAX: ffffffffffffffda RBX: 00007f1df53fdef0 RCX: 00007f1df618e90a RDX: 00002000000000c0 RSI: 0000200000000000 RDI: 00007f1df53fdeb0 RBP: 00002000000000c0 R08: 00007f1df53fdef0 R09: 0000000000800000 R10: 0000000000800000 R11: 0000000000000246 R12: 0000200000000000 R13: 00007f1df53fdeb0 R14: 0000000000005903 R15: 0000200000000200 Showing all locks held in the system: 1 lock held by khungtaskd/27: #0: ffffffff8e13eda0 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline] #0: ffffffff8e13eda0 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline] #0: ffffffff8e13eda0 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6770 2 locks held by kswapd1/78: #0: ffffffff8e247300 (fs_reclaim){+.+.}-{0:0}, at: balance_pgdat mm/vmscan.c:6985 [inline] #0: ffffffff8e247300 (fs_reclaim){+.+.}-{0:0}, at: kswapd+0x951/0x2830 mm/vmscan.c:7359 #1: ffffe8ffffc36090 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: acomp_ctx_get_cpu_lock mm/zswap.c:921 [inline] #1: ffffe8ffffc36090 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_compress mm/zswap.c:952 [inline] #1: ffffe8ffffc36090 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store_page mm/zswap.c:1495 [inline] #1: ffffe8ffffc36090 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store+0xc74/0x1d10 mm/zswap.c:1604 4 locks held by kworker/0:2/793: 2 locks held by getty/5114: #0: ffff8880003890a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc9000285c2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x43e/0x1400 drivers/tty/n_tty.c:2222 2 locks held by syz-executor/5753: #0: ffffffff8e247300 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4118 [inline] #0: ffffffff8e247300 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim+0xb8/0x300 mm/page_alloc.c:4143 #1: ffffe8ffffc36090 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: acomp_ctx_get_cpu_lock mm/zswap.c:921 [inline] #1: ffffe8ffffc36090 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_compress mm/zswap.c:952 [inline] #1: ffffe8ffffc36090 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store_page mm/zswap.c:1495 [inline] #1: ffffe8ffffc36090 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store+0xc74/0x1d10 mm/zswap.c:1604 4 locks held by syz.3.312/7028: 4 locks held by syz.5.314/7030: #0: ffff88801b2fe428 (sb_writers#5){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3092 [inline] #0: ffff88801b2fe428 (sb_writers#5){.+.+}-{0:0}, at: vfs_write+0x211/0xa90 fs/read_write.c:682 #1: ffff888011db1ce8 (&sb->s_type->i_mutex_key#13){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline] #1: ffff888011db1ce8 (&sb->s_type->i_mutex_key#13){+.+.}-{4:4}, at: shmem_file_write_iter+0x7f/0x120 mm/shmem.c:3453 #2: ffffffff8e247300 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4118 [inline] #2: ffffffff8e247300 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim+0xb8/0x300 mm/page_alloc.c:4143 #3: ffffe8ffffc36090 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: acomp_ctx_get_cpu_lock mm/zswap.c:921 [inline] #3: ffffe8ffffc36090 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_compress mm/zswap.c:952 [inline] #3: ffffe8ffffc36090 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store_page mm/zswap.c:1495 [inline] #3: ffffe8ffffc36090 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store+0xc74/0x1d10 mm/zswap.c:1604 4 locks held by syz.2.313/7029: #0: ffff88801b2fe428 (sb_writers#5){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3092 [inline] #0: ffff88801b2fe428 (sb_writers#5){.+.+}-{0:0}, at: vfs_write+0x211/0xa90 fs/read_write.c:682 #1: ffff888011db0fd8 (&sb->s_type->i_mutex_key#13){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline] #1: ffff888011db0fd8 (&sb->s_type->i_mutex_key#13){+.+.}-{4:4}, at: shmem_file_write_iter+0x7f/0x120 mm/shmem.c:3453 #2: ffffffff8e247300 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4118 [inline] #2: ffffffff8e247300 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim+0xb8/0x300 mm/page_alloc.c:4143 #3: ffffe8ffffc36090 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: acomp_ctx_get_cpu_lock mm/zswap.c:921 [inline] #3: ffffe8ffffc36090 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_compress mm/zswap.c:952 [inline] #3: ffffe8ffffc36090 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store_page mm/zswap.c:1495 [inline] #3: ffffe8ffffc36090 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store+0xc74/0x1d10 mm/zswap.c:1604 4 locks held by syz.4.315/7032: #0: ffff88801b2fe428 (sb_writers#5){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3092 [inline] #0: ffff88801b2fe428 (sb_writers#5){.+.+}-{0:0}, at: vfs_write+0x211/0xa90 fs/read_write.c:682 #1: ffff8880593771d0 (&sb->s_type->i_mutex_key#13){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline] #1: ffff8880593771d0 (&sb->s_type->i_mutex_key#13){+.+.}-{4:4}, at: shmem_file_write_iter+0x7f/0x120 mm/shmem.c:3453 #2: ffffffff8e247300 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4118 [inline] #2: ffffffff8e247300 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim+0xb8/0x300 mm/page_alloc.c:4143 #3: ffffe8ffffc36090 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: acomp_ctx_get_cpu_lock mm/zswap.c:921 [inline] #3: ffffe8ffffc36090 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_compress mm/zswap.c:952 [inline] #3: ffffe8ffffc36090 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store_page mm/zswap.c:1495 [inline] #3: ffffe8ffffc36090 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store+0xc74/0x1d10 mm/zswap.c:1604 4 locks held by syz.1.316/7035: #0: ffff88801b2fe428 (sb_writers#5){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3092 [inline] #0: ffff88801b2fe428 (sb_writers#5){.+.+}-{0:0}, at: vfs_write+0x211/0xa90 fs/read_write.c:682 #1: ffff888059374418 (&sb->s_type->i_mutex_key#13){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline] #1: ffff888059374418 (&sb->s_type->i_mutex_key#13){+.+.}-{4:4}, at: shmem_file_write_iter+0x7f/0x120 mm/shmem.c:3453 #2: ffffffff8e247300 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4118 [inline] #2: ffffffff8e247300 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim+0xb8/0x300 mm/page_alloc.c:4143 #3: ffffe8ffffc36090 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: acomp_ctx_get_cpu_lock mm/zswap.c:921 [inline] #3: ffffe8ffffc36090 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_compress mm/zswap.c:952 [inline] #3: ffffe8ffffc36090 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store_page mm/zswap.c:1495 [inline] #3: ffffe8ffffc36090 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store+0xc74/0x1d10 mm/zswap.c:1604 4 locks held by syz.6.317/7036: #0: ffff88801b2fe428 (sb_writers#5){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:3092 [inline] #0: ffff88801b2fe428 (sb_writers#5){.+.+}-{0:0}, at: vfs_write+0x211/0xa90 fs/read_write.c:682 #1: ffff8880529d0fd8 (&sb->s_type->i_mutex_key#13){+.+.}-{4:4}, at: inode_lock include/linux/fs.h:867 [inline] #1: ffff8880529d0fd8 (&sb->s_type->i_mutex_key#13){+.+.}-{4:4}, at: shmem_file_write_iter+0x7f/0x120 mm/shmem.c:3453 #2: ffffffff8e247300 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4118 [inline] #2: ffffffff8e247300 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim+0xb8/0x300 mm/page_alloc.c:4143 #3: ffffe8ffffc36090 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: acomp_ctx_get_cpu_lock mm/zswap.c:921 [inline] #3: ffffe8ffffc36090 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_compress mm/zswap.c:952 [inline] #3: ffffe8ffffc36090 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store_page mm/zswap.c:1495 [inline] #3: ffffe8ffffc36090 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store+0xc74/0x1d10 mm/zswap.c:1604 ============================================= NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 27 Comm: khungtaskd Not tainted 6.16.0-rc1-syzkaller-g27605c8c0f69 #0 PREEMPT(full) Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014 Call Trace: dump_stack_lvl+0x189/0x250 lib/dump_stack.c:120 nmi_cpu_backtrace+0x39e/0x3d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:307 [inline] watchdog+0xfee/0x1030 kernel/hung_task.c:470 kthread+0x70e/0x8a0 kernel/kthread.c:464 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245