INFO: task syz.0.541:8967 blocked for more than 145 seconds. Not tainted 6.15.0-rc2-syzkaller-gc72692105976 #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.541 state:D stack:0 pid:8967 tgid:8966 ppid:6472 task_flags:0x400140 flags:0x00000009 Call trace: __switch_to+0x414/0x788 arch/arm64/kernel/process.c:701 (T) context_switch kernel/sched/core.c:5382 [inline] __schedule+0x16a4/0x2c80 kernel/sched/core.c:6767 __schedule_loop kernel/sched/core.c:6845 [inline] schedule+0xbc/0x238 kernel/sched/core.c:6860 schedule_preempt_disabled+0x18/0x2c kernel/sched/core.c:6917 __mutex_lock_common+0xda8/0x2604 kernel/locking/mutex.c:678 __mutex_lock kernel/locking/mutex.c:746 [inline] mutex_lock_nested+0x2c/0x38 kernel/locking/mutex.c:798 bio_find_or_create_slab block/bio.c:122 [inline] bioset_init+0x1d0/0x6cc block/bio.c:1705 bch2_fs_alloc fs/bcachefs/super.c:922 [inline] bch2_fs_open+0x2000/0x2a48 fs/bcachefs/super.c:2209 bch2_fs_get_tree+0x598/0x12cc fs/bcachefs/fs.c:2172 vfs_get_tree+0x90/0x28c fs/super.c:1759 do_new_mount+0x278/0x900 fs/namespace.c:3879 path_mount+0x590/0xe04 fs/namespace.c:4206 do_mount fs/namespace.c:4219 [inline] __do_sys_mount fs/namespace.c:4430 [inline] __se_sys_mount fs/namespace.c:4407 [inline] __arm64_sys_mount+0x4f4/0x5d0 fs/namespace.c:4407 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 INFO: task syz.0.541:8967 is blocked on a mutex likely owned by task syz.2.535:8927. task:syz.2.535 state:R running task stack:0 pid:8927 tgid:8924 ppid:6480 task_flags:0x400140 flags:0x0000000d Call trace: __switch_to+0x414/0x788 arch/arm64/kernel/process.c:701 (T) context_switch kernel/sched/core.c:5382 [inline] __schedule+0x16a4/0x2c80 kernel/sched/core.c:6767 preempt_schedule_common+0xe8/0x1dc kernel/sched/core.c:6947 preempt_schedule+0x60/0x80 kernel/sched/core.c:6971 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:152 [inline] _raw_spin_unlock_irqrestore+0x94/0x98 kernel/locking/spinlock.c:194 kasan_quarantine_remove_cache+0x248/0x3f0 mm/kasan/quarantine.c:372 kasan_cache_shutdown+0x24/0x34 mm/kasan/generic.c:212 kmem_cache_destroy+0x80/0x174 mm/slab_common.c:521 bio_put_slab block/bio.c:155 [inline] bioset_exit+0x328/0x42c block/bio.c:1664 bch2_fs_fs_io_direct_exit+0x30/0x40 fs/bcachefs/fs-io-direct.c:685 __bch2_fs_free fs/bcachefs/super.c:561 [inline] bch2_fs_release+0x1b8/0x720 fs/bcachefs/super.c:627 kobject_cleanup lib/kobject.c:689 [inline] kobject_release lib/kobject.c:720 [inline] kref_put include/linux/kref.h:65 [inline] kobject_put+0x2a8/0x41c lib/kobject.c:737 bch2_fs_free+0x314/0x384 fs/bcachefs/super.c:690 bch2_kill_sb+0x48/0x58 fs/bcachefs/fs.c:2304 deactivate_locked_super+0xc4/0x12c fs/super.c:473 bch2_fs_get_tree+0xd4c/0x12cc fs/bcachefs/fs.c:2295 vfs_get_tree+0x90/0x28c fs/super.c:1759 do_new_mount+0x278/0x900 fs/namespace.c:3879 path_mount+0x590/0xe04 fs/namespace.c:4206 do_mount fs/namespace.c:4219 [inline] __do_sys_mount fs/namespace.c:4430 [inline] __se_sys_mount fs/namespace.c:4407 [inline] __arm64_sys_mount+0x4f4/0x5d0 fs/namespace.c:4407 __invoke_syscall arch/arm64/kernel/syscall.c:35 [inline] invoke_syscall+0x98/0x2b8 arch/arm64/kernel/syscall.c:49 el0_svc_common+0x130/0x23c arch/arm64/kernel/syscall.c:132 do_el0_svc+0x48/0x58 arch/arm64/kernel/syscall.c:151 el0_svc+0x54/0x168 arch/arm64/kernel/entry-common.c:744 el0t_64_sync_handler+0x84/0x108 arch/arm64/kernel/entry-common.c:762 el0t_64_sync+0x198/0x19c arch/arm64/kernel/entry.S:600 Showing all locks held in the system: 2 locks held by kthreadd/2: #0: ffff80009020e2e0 (fs_reclaim){+.+.}-{0:0}, at: __perform_reclaim mm/page_alloc.c:4101 [inline] #0: ffff80009020e2e0 (fs_reclaim){+.+.}-{0:0}, at: __alloc_pages_direct_reclaim+0xd4/0x330 mm/page_alloc.c:4126 #1: fffffdffbf7d44d0 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: acomp_ctx_get_cpu_lock mm/zswap.c:921 [inline] #1: fffffdffbf7d44d0 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_compress mm/zswap.c:952 [inline] #1: fffffdffbf7d44d0 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store_page mm/zswap.c:1495 [inline] #1: fffffdffbf7d44d0 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store+0x82c/0x1830 mm/zswap.c:1604 2 locks held by kworker/u8:1/14: 1 lock held by khungtaskd/32: #0: ffff800090118020 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire+0x4/0x48 include/linux/rcupdate.h:330 3 locks held by kworker/u8:3/45: 2 locks held by kswapd0/77: 2 locks held by kworker/u8:5/347: 3 locks held by kworker/u8:9/4333: 4 locks held by syslogd/6074: 2 locks held by udevd/6089: 2 locks held by dhcpcd/6142: 1 lock held by dhcpcd/6143: 2 locks held by getty/6226: #0: ffff0000d23990a0 (&tty->ldisc_sem){++++}-{0:0}, at: ldsem_down_read+0x3c/0x4c drivers/tty/tty_ldsem.c:340 #1: ffff80009c1be2f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x46c/0x123c drivers/tty/n_tty.c:2222 4 locks held by syz-executor/6476: #0: ffff0000d4e7c420 (sb_writers#5){.+.+}-{0:0}, at: mnt_want_write+0x44/0x9c fs/namespace.c:556 #1: ffff0000ede81ce8 (&type->i_mutex_dir_key#5/1){+.+.}-{4:4}, at: inode_lock_nested include/linux/fs.h:902 [inline] #1: ffff0000ede81ce8 (&type->i_mutex_dir_key#5/1){+.+.}-{4:4}, at: do_unlinkat+0x2dc/0x698 fs/namei.c:4595 #2: ffff8000907feb50 (tomoyo_ss){.+.+}-{0:0}, at: srcu_lock_acquire+0x10/0x4c include/linux/srcu.h:160 #3: fffffdffbf7f84d0 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: acomp_ctx_get_cpu_lock mm/zswap.c:921 [inline] #3: fffffdffbf7f84d0 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_compress mm/zswap.c:952 [inline] #3: fffffdffbf7f84d0 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store_page mm/zswap.c:1495 [inline] #3: fffffdffbf7f84d0 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store+0x82c/0x1830 mm/zswap.c:1604 3 locks held by syz-executor/6483: 3 locks held by kworker/u8:10/6568: 3 locks held by syz.2.535/8927: 1 lock held by syz.0.541/8967: #0: ffff800090833d28 (bio_slab_lock){+.+.}-{4:4}, at: bio_find_or_create_slab block/bio.c:122 [inline] #0: ffff800090833d28 (bio_slab_lock){+.+.}-{4:4}, at: bioset_init+0x1d0/0x6cc block/bio.c:1705 2 locks held by udevadm/8976: #0: ffff8000907feb50 (tomoyo_ss){.+.+}-{0:0}, at: srcu_lock_acquire+0x10/0x4c include/linux/srcu.h:160 #1: fffffdffbf7d44d0 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: acomp_ctx_get_cpu_lock mm/zswap.c:921 [inline] #1: fffffdffbf7d44d0 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_compress mm/zswap.c:952 [inline] #1: fffffdffbf7d44d0 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store_page mm/zswap.c:1495 [inline] #1: fffffdffbf7d44d0 (&per_cpu_ptr(pool->acomp_ctx, cpu)->mutex){+.+.}-{4:4}, at: zswap_store+0x82c/0x1830 mm/zswap.c:1604 2 locks held by syz-executor/9002: =============================================