------------[ cut here ]------------ WARNING: CPU: 0 PID: 3355 at fs/kernfs/dir.c:504 kernfs_get fs/kernfs/dir.c:504 [inline] WARNING: CPU: 0 PID: 3355 at fs/kernfs/dir.c:504 __kernfs_remove+0x6f4/0x7d8 fs/kernfs/dir.c:1377 Modules linked in: CPU: 0 PID: 3355 Comm: syz-executor220 Not tainted 6.0.0-rc7-syzkaller-18095-gbbed346d5a96 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022 pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : kernfs_get fs/kernfs/dir.c:504 [inline] pc : __kernfs_remove+0x6f4/0x7d8 fs/kernfs/dir.c:1377 lr : kernfs_get fs/kernfs/dir.c:504 [inline] lr : __kernfs_remove+0x6f4/0x7d8 fs/kernfs/dir.c:1377 sp : ffff800012b0b8a0 x29: ffff800012b0b8d0 x28: ffff80000cee8161 x27: 0000000080000001 x26: ffff0000c0011a00 x25: ffff80000d30c000 x24: ffff0000caa8b7e0 x23: ffff0000caa8b6d0 x22: 0000000000000000 x21: ffff0000caa8b7e0 x20: ffff0000caa8b7e0 x19: ffff8000086f7744 x18: 00000000000003c0 x17: 000000000000b67e x16: ffff80000db49158 x15: ffff0000c10b8000 x14: 0000000000000000 x13: 00000000ffffffff x12: ffff0000c10b8000 x11: ff808000086f70dc x10: 0000000000000000 x9 : ffff8000086f70dc x8 : ffff0000c10b8000 x7 : ffff8000095d331c x6 : 0000000000000000 x5 : 0000000080180016 x4 : fffffc00032aa2e0 x3 : 0000000080180016 x2 : ffff0000caa8b7e0 x1 : 0000000000000000 x0 : 0000000000000000 Call trace: kernfs_get fs/kernfs/dir.c:504 [inline] __kernfs_remove+0x6f4/0x7d8 fs/kernfs/dir.c:1377 kernfs_remove_by_name_ns+0x68/0xb8 fs/kernfs/dir.c:1589 kernfs_remove_by_name include/linux/kernfs.h:615 [inline] sysfs_remove_link+0x40/0x50 fs/sysfs/symlink.c:152 sysfs_slab_add+0x70/0x274 mm/slub.c:5955 __kmem_cache_create+0x60/0x118 mm/slub.c:4906 create_cache mm/slab_common.c:229 [inline] kmem_cache_create_usercopy+0x19c/0x31c mm/slab_common.c:335 p9_client_create+0x618/0x758 net/9p/client.c:993 v9fs_session_init+0xa4/0x9f0 fs/9p/v9fs.c:408 v9fs_mount+0x6c/0x568 fs/9p/vfs_super.c:126 legacy_get_tree+0x30/0x74 fs/fs_context.c:610 vfs_get_tree+0x40/0x140 fs/super.c:1530 do_new_mount+0x1dc/0x4e4 fs/namespace.c:3040 path_mount+0x358/0x914 fs/namespace.c:3370 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount fs/namespace.c:3568 [inline] __arm64_sys_mount+0x2c4/0x3c4 fs/namespace.c:3568 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall arch/arm64/kernel/syscall.c:52 [inline] el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x48/0x164 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:636 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:654 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 irq event stamp: 970 hardirqs last enabled at (969): [] __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:151 [inline] hardirqs last enabled at (969): [] _raw_spin_unlock_irqrestore+0x48/0x8c kernel/locking/spinlock.c:194 hardirqs last disabled at (970): [] el1_dbg+0x24/0x5c arch/arm64/kernel/entry-common.c:404 softirqs last enabled at (618): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (616): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 ---[ end trace 0000000000000000 ]--- ============================= WARNING: suspicious RCU usage 6.0.0-rc7-syzkaller-18095-gbbed346d5a96 #0 Tainted: G W ----------------------------- kernel/sched/core.c:9854 Illegal context switch in RCU-bh read-side critical section! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 1 lock held by syz-executor220/3355: #0: ffff80000d462a50 (slab_mutex){+.+.}-{3:3}, at: kmem_cache_create_usercopy+0x74/0x31c mm/slab_common.c:298 stack backtrace: CPU: 1 PID: 3355 Comm: syz-executor220 Tainted: G W 6.0.0-rc7-syzkaller-18095-gbbed346d5a96 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022 Call trace: dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:156 show_stack+0x2c/0x54 arch/arm64/kernel/stacktrace.c:163 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x104/0x16c lib/dump_stack.c:106 dump_stack+0x1c/0x58 lib/dump_stack.c:113 lockdep_rcu_suspicious+0x138/0x154 kernel/locking/lockdep.c:6595 __might_resched+0x6c/0x218 kernel/sched/core.c:9854 __might_sleep+0x48/0x78 kernel/sched/core.c:9821 do_page_fault+0x214/0x79c arch/arm64/mm/fault.c:593 do_translation_fault+0x78/0x194 arch/arm64/mm/fault.c:685 do_mem_abort+0x54/0x130 arch/arm64/mm/fault.c:821 el1_abort+0x3c/0x5c arch/arm64/kernel/entry-common.c:366 el1h_64_sync_handler+0x60/0xac arch/arm64/kernel/entry-common.c:426 el1h_64_sync+0x64/0x68 arch/arm64/kernel/entry.S:576 __lock_acquire+0x60/0x30a4 kernel/locking/lockdep.c:4923 lock_acquire+0x100/0x1f8 kernel/locking/lockdep.c:5666 down_write+0x5c/0xcc kernel/locking/rwsem.c:1552 kernfs_add_one+0x44/0x2d4 fs/kernfs/dir.c:734 __kernfs_create_file+0x13c/0x188 fs/kernfs/file.c:1079 sysfs_add_file_mode_ns+0xf8/0x1b4 fs/sysfs/file.c:294 create_files fs/sysfs/group.c:64 [inline] internal_create_group+0x22c/0x654 fs/sysfs/group.c:148 sysfs_create_group+0x2c/0x3c fs/sysfs/group.c:174 sysfs_slab_add+0x15c/0x274 mm/slub.c:5972 __kmem_cache_create+0x60/0x118 mm/slub.c:4906 create_cache mm/slab_common.c:229 [inline] kmem_cache_create_usercopy+0x19c/0x31c mm/slab_common.c:335 p9_client_create+0x618/0x758 net/9p/client.c:993 v9fs_session_init+0xa4/0x9f0 fs/9p/v9fs.c:408 v9fs_mount+0x6c/0x568 fs/9p/vfs_super.c:126 legacy_get_tree+0x30/0x74 fs/fs_context.c:610 vfs_get_tree+0x40/0x140 fs/super.c:1530 do_new_mount+0x1dc/0x4e4 fs/namespace.c:3040 path_mount+0x358/0x914 fs/namespace.c:3370 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount fs/namespace.c:3568 [inline] __arm64_sys_mount+0x2c4/0x3c4 fs/namespace.c:3568 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall arch/arm64/kernel/syscall.c:52 [inline] el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x48/0x164 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:636 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:654 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 ============================= WARNING: suspicious RCU usage 6.0.0-rc7-syzkaller-18095-gbbed346d5a96 #0 Tainted: G W ----------------------------- kernel/sched/core.c:9854 Illegal context switch in RCU-sched read-side critical section! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 1 lock held by syz-executor220/3355: #0: ffff80000d462a50 (slab_mutex){+.+.}-{3:3}, at: kmem_cache_create_usercopy+0x74/0x31c mm/slab_common.c:298 stack backtrace: CPU: 1 PID: 3355 Comm: syz-executor220 Tainted: G W 6.0.0-rc7-syzkaller-18095-gbbed346d5a96 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022 Call trace: dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:156 show_stack+0x2c/0x54 arch/arm64/kernel/stacktrace.c:163 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x104/0x16c lib/dump_stack.c:106 dump_stack+0x1c/0x58 lib/dump_stack.c:113 lockdep_rcu_suspicious+0x138/0x154 kernel/locking/lockdep.c:6595 __might_resched+0xb4/0x218 kernel/sched/core.c:9854 __might_sleep+0x48/0x78 kernel/sched/core.c:9821 do_page_fault+0x214/0x79c arch/arm64/mm/fault.c:593 do_translation_fault+0x78/0x194 arch/arm64/mm/fault.c:685 do_mem_abort+0x54/0x130 arch/arm64/mm/fault.c:821 el1_abort+0x3c/0x5c arch/arm64/kernel/entry-common.c:366 el1h_64_sync_handler+0x60/0xac arch/arm64/kernel/entry-common.c:426 el1h_64_sync+0x64/0x68 arch/arm64/kernel/entry.S:576 __lock_acquire+0x60/0x30a4 kernel/locking/lockdep.c:4923 lock_acquire+0x100/0x1f8 kernel/locking/lockdep.c:5666 down_write+0x5c/0xcc kernel/locking/rwsem.c:1552 kernfs_add_one+0x44/0x2d4 fs/kernfs/dir.c:734 __kernfs_create_file+0x13c/0x188 fs/kernfs/file.c:1079 sysfs_add_file_mode_ns+0xf8/0x1b4 fs/sysfs/file.c:294 create_files fs/sysfs/group.c:64 [inline] internal_create_group+0x22c/0x654 fs/sysfs/group.c:148 sysfs_create_group+0x2c/0x3c fs/sysfs/group.c:174 sysfs_slab_add+0x15c/0x274 mm/slub.c:5972 __kmem_cache_create+0x60/0x118 mm/slub.c:4906 create_cache mm/slab_common.c:229 [inline] kmem_cache_create_usercopy+0x19c/0x31c mm/slab_common.c:335 p9_client_create+0x618/0x758 net/9p/client.c:993 v9fs_session_init+0xa4/0x9f0 fs/9p/v9fs.c:408 v9fs_mount+0x6c/0x568 fs/9p/vfs_super.c:126 legacy_get_tree+0x30/0x74 fs/fs_context.c:610 vfs_get_tree+0x40/0x140 fs/super.c:1530 do_new_mount+0x1dc/0x4e4 fs/namespace.c:3040 path_mount+0x358/0x914 fs/namespace.c:3370 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount fs/namespace.c:3568 [inline] __arm64_sys_mount+0x2c4/0x3c4 fs/namespace.c:3568 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall arch/arm64/kernel/syscall.c:52 [inline] el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x48/0x164 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:636 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:654 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 BUG: sleeping function called from invalid context at arch/arm64/mm/fault.c:593 in_atomic(): 0, irqs_disabled(): 128, non_block: 0, pid: 3355, name: syz-executor220 preempt_count: 0, expected: 0 RCU nest depth: 0, expected: 0 1 lock held by syz-executor220/3355: #0: ffff80000d462a50 (slab_mutex){+.+.}-{3:3}, at: kmem_cache_create_usercopy+0x74/0x31c mm/slab_common.c:298 irq event stamp: 1105 hardirqs last enabled at (1105): [] ___slab_alloc+0x778/0x880 mm/slub.c:2991 hardirqs last disabled at (1104): [] ___slab_alloc+0x540/0x880 mm/slub.c:2958 softirqs last enabled at (1062): [] _stext+0x2e4/0x37c softirqs last disabled at (973): [] ____do_softirq+0x14/0x20 arch/arm64/kernel/irq.c:79 CPU: 1 PID: 3355 Comm: syz-executor220 Tainted: G W 6.0.0-rc7-syzkaller-18095-gbbed346d5a96 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022 Call trace: dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:156 show_stack+0x2c/0x54 arch/arm64/kernel/stacktrace.c:163 __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x104/0x16c lib/dump_stack.c:106 dump_stack+0x1c/0x58 lib/dump_stack.c:113 __might_resched+0x208/0x218 kernel/sched/core.c:9892 __might_sleep+0x48/0x78 kernel/sched/core.c:9821 do_page_fault+0x214/0x79c arch/arm64/mm/fault.c:593 do_translation_fault+0x78/0x194 arch/arm64/mm/fault.c:685 do_mem_abort+0x54/0x130 arch/arm64/mm/fault.c:821 el1_abort+0x3c/0x5c arch/arm64/kernel/entry-common.c:366 el1h_64_sync_handler+0x60/0xac arch/arm64/kernel/entry-common.c:426 el1h_64_sync+0x64/0x68 arch/arm64/kernel/entry.S:576 __lock_acquire+0x60/0x30a4 kernel/locking/lockdep.c:4923 lock_acquire+0x100/0x1f8 kernel/locking/lockdep.c:5666 down_write+0x5c/0xcc kernel/locking/rwsem.c:1552 kernfs_add_one+0x44/0x2d4 fs/kernfs/dir.c:734 __kernfs_create_file+0x13c/0x188 fs/kernfs/file.c:1079 sysfs_add_file_mode_ns+0xf8/0x1b4 fs/sysfs/file.c:294 create_files fs/sysfs/group.c:64 [inline] internal_create_group+0x22c/0x654 fs/sysfs/group.c:148 sysfs_create_group+0x2c/0x3c fs/sysfs/group.c:174 sysfs_slab_add+0x15c/0x274 mm/slub.c:5972 __kmem_cache_create+0x60/0x118 mm/slub.c:4906 create_cache mm/slab_common.c:229 [inline] kmem_cache_create_usercopy+0x19c/0x31c mm/slab_common.c:335 p9_client_create+0x618/0x758 net/9p/client.c:993 v9fs_session_init+0xa4/0x9f0 fs/9p/v9fs.c:408 v9fs_mount+0x6c/0x568 fs/9p/vfs_super.c:126 legacy_get_tree+0x30/0x74 fs/fs_context.c:610 vfs_get_tree+0x40/0x140 fs/super.c:1530 do_new_mount+0x1dc/0x4e4 fs/namespace.c:3040 path_mount+0x358/0x914 fs/namespace.c:3370 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount fs/namespace.c:3568 [inline] __arm64_sys_mount+0x2c4/0x3c4 fs/namespace.c:3568 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall arch/arm64/kernel/syscall.c:52 [inline] el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x48/0x164 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:636 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:654 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 Unable to handle kernel paging request at virtual address 0000000000001148 Mem abort info: ESR = 0x0000000096000006 EC = 0x25: DABT (current EL), IL = 32 bits SET = 0, FnV = 0 EA = 0, S1PTW = 0 FSC = 0x06: level 2 translation fault Data abort info: ISV = 0, ISS = 0x00000006 CM = 0, WnR = 0 user pgtable: 4k pages, 48-bit VAs, pgdp=000000010a0e0000 [0000000000001148] pgd=080000010a006003, p4d=080000010a006003, pud=080000010aa38003, pmd=0000000000000000 Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP Modules linked in: CPU: 1 PID: 3355 Comm: syz-executor220 Tainted: G W 6.0.0-rc7-syzkaller-18095-gbbed346d5a96 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/30/2022 pstate: 804000c5 (Nzcv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : __lock_acquire+0x60/0x30a4 kernel/locking/lockdep.c:4923 lr : lock_acquire+0x100/0x1f8 kernel/locking/lockdep.c:5666 sp : ffff800012b0b5e0 x29: ffff800012b0b6c0 x28: 0000000000000000 x27: 0000000000000000 x26: 0000000000001148 x25: ffff8000086f4a58 x24: 0000000000000000 x23: 0000000000000000 x22: 0000000000001148 x21: 0000000000000000 x20: 0000000000000000 x19: 0000000000000000 x18: 0000000000000183 x17: 0000000000000000 x16: ffff80000db49158 x15: ffff0000c10b8000 x14: 0000000000000008 x13: 00000000ffffffff x12: ffff0000c10b8000 x11: ff808000095d1a0c x10: 0000000000000000 x9 : 0000000000000001 x8 : 0000000000000001 x7 : ffff8000086f4a58 x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000 x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000001148 Call trace: __lock_acquire+0x60/0x30a4 kernel/locking/lockdep.c:4923 lock_acquire+0x100/0x1f8 kernel/locking/lockdep.c:5666 down_write+0x5c/0xcc kernel/locking/rwsem.c:1552 kernfs_add_one+0x44/0x2d4 fs/kernfs/dir.c:734 __kernfs_create_file+0x13c/0x188 fs/kernfs/file.c:1079 sysfs_add_file_mode_ns+0xf8/0x1b4 fs/sysfs/file.c:294 create_files fs/sysfs/group.c:64 [inline] internal_create_group+0x22c/0x654 fs/sysfs/group.c:148 sysfs_create_group+0x2c/0x3c fs/sysfs/group.c:174 sysfs_slab_add+0x15c/0x274 mm/slub.c:5972 __kmem_cache_create+0x60/0x118 mm/slub.c:4906 create_cache mm/slab_common.c:229 [inline] kmem_cache_create_usercopy+0x19c/0x31c mm/slab_common.c:335 p9_client_create+0x618/0x758 net/9p/client.c:993 v9fs_session_init+0xa4/0x9f0 fs/9p/v9fs.c:408 v9fs_mount+0x6c/0x568 fs/9p/vfs_super.c:126 legacy_get_tree+0x30/0x74 fs/fs_context.c:610 vfs_get_tree+0x40/0x140 fs/super.c:1530 do_new_mount+0x1dc/0x4e4 fs/namespace.c:3040 path_mount+0x358/0x914 fs/namespace.c:3370 do_mount fs/namespace.c:3383 [inline] __do_sys_mount fs/namespace.c:3591 [inline] __se_sys_mount fs/namespace.c:3568 [inline] __arm64_sys_mount+0x2c4/0x3c4 fs/namespace.c:3568 __invoke_syscall arch/arm64/kernel/syscall.c:38 [inline] invoke_syscall arch/arm64/kernel/syscall.c:52 [inline] el0_svc_common+0x138/0x220 arch/arm64/kernel/syscall.c:142 do_el0_svc+0x48/0x164 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:636 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:654 el0t_64_sync+0x18c/0x190 arch/arm64/kernel/entry.S:581 Code: 2a0303f4 2a0203f7 aa0003fa 34000148 (f9400348) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: 2a0303f4 mov w20, w3 4: 2a0203f7 mov w23, w2 8: aa0003fa mov x26, x0 c: 34000148 cbz w8, 0x34 * 10: f9400348 ldr x8, [x26] <-- trapping instruction