loop4: detected capacity change from 0 to 32768 ============================= WARNING: suspicious RCU usage 6.2.0-rc5-syzkaller-17291-g2e84eedb182e #0 Not tainted ----------------------------- kernel/sched/core.c:9998 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 no locks held by syz-executor.4/20886. stack backtrace: CPU: 1 PID: 20886 Comm: syz-executor.4 Not tainted 6.2.0-rc5-syzkaller-17291-g2e84eedb182e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call trace: dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:156 show_stack+0x2c/0x3c 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:6597 __might_resched+0x6c/0x218 kernel/sched/core.c:9998 __might_sleep+0x48/0x78 kernel/sched/core.c:9965 do_page_fault+0x214/0x79c arch/arm64/mm/fault.c:603 do_translation_fault+0x78/0x194 arch/arm64/mm/fault.c:695 do_mem_abort+0x54/0x130 arch/arm64/mm/fault.c:831 el1_abort+0x3c/0x5c arch/arm64/kernel/entry-common.c:367 el1h_64_sync_handler+0x60/0xac arch/arm64/kernel/entry-common.c:427 el1h_64_sync+0x64/0x68 arch/arm64/kernel/entry.S:579 __pi_strcmp+0x9c/0x140 arch/arm64/lib/strcmp.S:126 register_lock_class+0x1cc/0x2f8 kernel/locking/lockdep.c:1337 __lock_acquire+0xa8/0x3084 kernel/locking/lockdep.c:4934 lock_acquire+0x100/0x1f8 kernel/locking/lockdep.c:5668 down_write_nested+0x64/0x94 kernel/locking/rwsem.c:1672 inode_lock_nested include/linux/fs.h:791 [inline] open_xa_root fs/reiserfs/xattr.c:127 [inline] open_xa_dir+0x5c/0x2a8 fs/reiserfs/xattr.c:152 xattr_lookup+0x34/0x198 fs/reiserfs/xattr.c:395 reiserfs_xattr_get+0x8c/0x6a8 fs/reiserfs/xattr.c:677 reiserfs_get_acl+0x84/0x1ac fs/reiserfs/xattr_acl.c:215 __get_acl+0x258/0x3fc fs/posix_acl.c:159 get_inode_acl+0x34/0x44 fs/posix_acl.c:184 check_acl+0x40/0x178 fs/namei.c:306 acl_permission_check fs/namei.c:351 [inline] generic_permission+0x284/0x340 fs/namei.c:404 reiserfs_permission+0x4c/0x6c fs/reiserfs/xattr.c:954 do_inode_permission fs/namei.c:458 [inline] inode_permission+0x128/0x244 fs/namei.c:525 may_open+0x1e4/0x2bc fs/namei.c:3185 do_open fs/namei.c:3555 [inline] path_openat+0xdd0/0x11f0 fs/namei.c:3714 do_filp_open+0xdc/0x1b8 fs/namei.c:3741 do_sys_openat2+0xb8/0x22c fs/open.c:1310 do_sys_open fs/open.c:1326 [inline] __do_sys_openat fs/open.c:1342 [inline] __se_sys_openat fs/open.c:1337 [inline] __arm64_sys_openat+0xb0/0xe0 fs/open.c:1337 __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+0x48/0x104 arch/arm64/kernel/syscall.c:193 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:584 ============================= WARNING: suspicious RCU usage 6.2.0-rc5-syzkaller-17291-g2e84eedb182e #0 Not tainted ----------------------------- kernel/sched/core.c:9998 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 no locks held by syz-executor.4/20886. stack backtrace: CPU: 1 PID: 20886 Comm: syz-executor.4 Not tainted 6.2.0-rc5-syzkaller-17291-g2e84eedb182e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call trace: dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:156 show_stack+0x2c/0x3c 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:6597 __might_resched+0xb4/0x218 kernel/sched/core.c:9998 __might_sleep+0x48/0x78 kernel/sched/core.c:9965 do_page_fault+0x214/0x79c arch/arm64/mm/fault.c:603 do_translation_fault+0x78/0x194 arch/arm64/mm/fault.c:695 do_mem_abort+0x54/0x130 arch/arm64/mm/fault.c:831 el1_abort+0x3c/0x5c arch/arm64/kernel/entry-common.c:367 el1h_64_sync_handler+0x60/0xac arch/arm64/kernel/entry-common.c:427 el1h_64_sync+0x64/0x68 arch/arm64/kernel/entry.S:579 __pi_strcmp+0x9c/0x140 arch/arm64/lib/strcmp.S:126 register_lock_class+0x1cc/0x2f8 kernel/locking/lockdep.c:1337 __lock_acquire+0xa8/0x3084 kernel/locking/lockdep.c:4934 lock_acquire+0x100/0x1f8 kernel/locking/lockdep.c:5668 down_write_nested+0x64/0x94 kernel/locking/rwsem.c:1672 inode_lock_nested include/linux/fs.h:791 [inline] open_xa_root fs/reiserfs/xattr.c:127 [inline] open_xa_dir+0x5c/0x2a8 fs/reiserfs/xattr.c:152 xattr_lookup+0x34/0x198 fs/reiserfs/xattr.c:395 reiserfs_xattr_get+0x8c/0x6a8 fs/reiserfs/xattr.c:677 reiserfs_get_acl+0x84/0x1ac fs/reiserfs/xattr_acl.c:215 __get_acl+0x258/0x3fc fs/posix_acl.c:159 get_inode_acl+0x34/0x44 fs/posix_acl.c:184 check_acl+0x40/0x178 fs/namei.c:306 acl_permission_check fs/namei.c:351 [inline] generic_permission+0x284/0x340 fs/namei.c:404 reiserfs_permission+0x4c/0x6c fs/reiserfs/xattr.c:954 do_inode_permission fs/namei.c:458 [inline] inode_permission+0x128/0x244 fs/namei.c:525 may_open+0x1e4/0x2bc fs/namei.c:3185 do_open fs/namei.c:3555 [inline] path_openat+0xdd0/0x11f0 fs/namei.c:3714 do_filp_open+0xdc/0x1b8 fs/namei.c:3741 do_sys_openat2+0xb8/0x22c fs/open.c:1310 do_sys_open fs/open.c:1326 [inline] __do_sys_openat fs/open.c:1342 [inline] __se_sys_openat fs/open.c:1337 [inline] __arm64_sys_openat+0xb0/0xe0 fs/open.c:1337 __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+0x48/0x104 arch/arm64/kernel/syscall.c:193 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:584 BUG: sleeping function called from invalid context at arch/arm64/mm/fault.c:603 in_atomic(): 0, irqs_disabled(): 128, non_block: 0, pid: 20886, name: syz-executor.4 preempt_count: 0, expected: 0 RCU nest depth: 0, expected: 0 no locks held by syz-executor.4/20886. irq event stamp: 74425 hardirqs last enabled at (74425): [] seqcount_lockdep_reader_access include/linux/seqlock.h:104 [inline] hardirqs last enabled at (74425): [] read_seqbegin include/linux/seqlock.h:836 [inline] hardirqs last enabled at (74425): [] lookup_mnt+0x180/0x42c fs/namespace.c:814 hardirqs last disabled at (74424): [] seqcount_lockdep_reader_access include/linux/seqlock.h:101 [inline] hardirqs last disabled at (74424): [] read_seqbegin include/linux/seqlock.h:836 [inline] hardirqs last disabled at (74424): [] lookup_mnt+0x110/0x42c fs/namespace.c:814 softirqs last enabled at (74412): [] local_bh_enable+0x10/0x34 include/linux/bottom_half.h:32 softirqs last disabled at (74410): [] local_bh_disable+0x10/0x34 include/linux/bottom_half.h:19 CPU: 1 PID: 20886 Comm: syz-executor.4 Not tainted 6.2.0-rc5-syzkaller-17291-g2e84eedb182e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call trace: dump_backtrace+0x1c4/0x1f0 arch/arm64/kernel/stacktrace.c:156 show_stack+0x2c/0x3c 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:10036 __might_sleep+0x48/0x78 kernel/sched/core.c:9965 do_page_fault+0x214/0x79c arch/arm64/mm/fault.c:603 do_translation_fault+0x78/0x194 arch/arm64/mm/fault.c:695 do_mem_abort+0x54/0x130 arch/arm64/mm/fault.c:831 el1_abort+0x3c/0x5c arch/arm64/kernel/entry-common.c:367 el1h_64_sync_handler+0x60/0xac arch/arm64/kernel/entry-common.c:427 el1h_64_sync+0x64/0x68 arch/arm64/kernel/entry.S:579 __pi_strcmp+0x9c/0x140 arch/arm64/lib/strcmp.S:126 register_lock_class+0x1cc/0x2f8 kernel/locking/lockdep.c:1337 __lock_acquire+0xa8/0x3084 kernel/locking/lockdep.c:4934 lock_acquire+0x100/0x1f8 kernel/locking/lockdep.c:5668 down_write_nested+0x64/0x94 kernel/locking/rwsem.c:1672 inode_lock_nested include/linux/fs.h:791 [inline] open_xa_root fs/reiserfs/xattr.c:127 [inline] open_xa_dir+0x5c/0x2a8 fs/reiserfs/xattr.c:152 xattr_lookup+0x34/0x198 fs/reiserfs/xattr.c:395 reiserfs_xattr_get+0x8c/0x6a8 fs/reiserfs/xattr.c:677 reiserfs_get_acl+0x84/0x1ac fs/reiserfs/xattr_acl.c:215 __get_acl+0x258/0x3fc fs/posix_acl.c:159 get_inode_acl+0x34/0x44 fs/posix_acl.c:184 check_acl+0x40/0x178 fs/namei.c:306 acl_permission_check fs/namei.c:351 [inline] generic_permission+0x284/0x340 fs/namei.c:404 reiserfs_permission+0x4c/0x6c fs/reiserfs/xattr.c:954 do_inode_permission fs/namei.c:458 [inline] inode_permission+0x128/0x244 fs/namei.c:525 may_open+0x1e4/0x2bc fs/namei.c:3185 do_open fs/namei.c:3555 [inline] path_openat+0xdd0/0x11f0 fs/namei.c:3714 do_filp_open+0xdc/0x1b8 fs/namei.c:3741 do_sys_openat2+0xb8/0x22c fs/open.c:1310 do_sys_open fs/open.c:1326 [inline] __do_sys_openat fs/open.c:1342 [inline] __se_sys_openat fs/open.c:1337 [inline] __arm64_sys_openat+0xb0/0xe0 fs/open.c:1337 __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+0x48/0x104 arch/arm64/kernel/syscall.c:193 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:584 Unable to handle kernel NULL pointer dereference at virtual address 0000000000000001 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=000000015b3f2000 [0000000000000001] pgd=080000015c73d003, p4d=080000015c73d003, pud=080000015d829003, pmd=0000000000000000 Internal error: Oops: 0000000096000006 [#1] PREEMPT SMP Modules linked in: CPU: 1 PID: 20886 Comm: syz-executor.4 Tainted: G W 6.2.0-rc5-syzkaller-17291-g2e84eedb182e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 pstate: 004000c5 (nzcv daIF +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : __pi_strcmp+0x9c/0x140 arch/arm64/lib/strcmp.S:127 lr : count_matching_names+0x70/0xb4 kernel/locking/lockdep.c:878 sp : ffff8000138db570 x29: ffff8000138db570 x28: 0000000000000000 x27: 0000000000000000 x26: ffff80000ddb6228 x25: ffff8000087b80d4 x24: 0000000000000c52 x23: ffff80000ddb6228 x22: 0000000000000000 x21: ffff80000d572b40 x20: ffff80000dd97128 x19: 0000000000000001 x18: 0000000000000000 x17: 0000000000000000 x16: 0000000000000000 x15: 0000000000000000 x14: 0000000000000002 x13: 0000000000008000 x12: 00000000ff1bffff x11: ffff80000df59158 x10: 00007ffff32afd6b x9 : 0000000000000003 x8 : 0101010101010101 x7 : ffff8000087b80d4 x6 : 0000000000000006 x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000000 x2 : 0000000000000066 x1 : 0000000000000001 x0 : ffff80000cd50297 Call trace: __pi_strcmp+0x9c/0x140 arch/arm64/lib/strcmp.S:126 register_lock_class+0x1cc/0x2f8 kernel/locking/lockdep.c:1337 __lock_acquire+0xa8/0x3084 kernel/locking/lockdep.c:4934 lock_acquire+0x100/0x1f8 kernel/locking/lockdep.c:5668 down_write_nested+0x64/0x94 kernel/locking/rwsem.c:1672 inode_lock_nested include/linux/fs.h:791 [inline] open_xa_root fs/reiserfs/xattr.c:127 [inline] open_xa_dir+0x5c/0x2a8 fs/reiserfs/xattr.c:152 xattr_lookup+0x34/0x198 fs/reiserfs/xattr.c:395 reiserfs_xattr_get+0x8c/0x6a8 fs/reiserfs/xattr.c:677 reiserfs_get_acl+0x84/0x1ac fs/reiserfs/xattr_acl.c:215 __get_acl+0x258/0x3fc fs/posix_acl.c:159 get_inode_acl+0x34/0x44 fs/posix_acl.c:184 check_acl+0x40/0x178 fs/namei.c:306 acl_permission_check fs/namei.c:351 [inline] generic_permission+0x284/0x340 fs/namei.c:404 reiserfs_permission+0x4c/0x6c fs/reiserfs/xattr.c:954 do_inode_permission fs/namei.c:458 [inline] inode_permission+0x128/0x244 fs/namei.c:525 may_open+0x1e4/0x2bc fs/namei.c:3185 do_open fs/namei.c:3555 [inline] path_openat+0xdd0/0x11f0 fs/namei.c:3714 do_filp_open+0xdc/0x1b8 fs/namei.c:3741 do_sys_openat2+0xb8/0x22c fs/open.c:1310 do_sys_open fs/open.c:1326 [inline] __do_sys_openat fs/open.c:1342 [inline] __se_sys_openat fs/open.c:1337 [inline] __arm64_sys_openat+0xb0/0xe0 fs/open.c:1337 __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+0x48/0x104 arch/arm64/kernel/syscall.c:193 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:637 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:655 el0t_64_sync+0x190/0x194 arch/arm64/kernel/entry.S:584 Code: aa060063 17ffffe6 b4000106 38401402 (38401423) ---[ end trace 0000000000000000 ]--- ---------------- Code disassembly (best guess): 0: aa060063 orr x3, x3, x6 4: 17ffffe6 b 0xffffffffffffff9c 8: b4000106 cbz x6, 0x28 c: 38401402 ldrb w2, [x0], #1 * 10: 38401423 ldrb w3, [x1], #1 <-- trapping instruction