Hello, syzbot found the following issue on: HEAD commit: 85413d1e802e Merge branch 'for-next/fixes' into for-kernelci git tree: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci console output: https://syzkaller.appspot.com/x/log.txt?x=110d078b080000 kernel config: https://syzkaller.appspot.com/x/.config?x=57b9bfeca947ab90 dashboard link: https://syzkaller.appspot.com/bug?extid=3bca50295c8d986d2d16 compiler: Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2 userspace arch: arm64 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=1796b3ad080000 C reproducer: https://syzkaller.appspot.com/x/repro.c?x=13081a8b080000 IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+3bca50295c8d986d2d16@xxxxxxxxxxxxxxxxxxxxxxxxx ============================= WARNING: suspicious RCU usage 6.0.0-rc3-syzkaller-16800-g85413d1e802e #0 Not tainted ----------------------------- 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 3 locks held by syz-executor478/3038: #0: ffff0000c90e7188 (&p->lock){+.+.}-{3:3}, at: seq_read_iter+0x5c/0x5e0 fs/seq_file.c:182 #1: ffff80000d82d328 (binder_procs_lock){+.+.}-{3:3}, at: stats_show+0x60/0x3e0 drivers/android/binder.c:6350 #2: ffff0000c937aa48 (&alloc->mutex){+.+.}-{3:3}, at: binder_alloc_print_pages+0x38/0x218 drivers/android/binder_alloc.c:930 stack backtrace: CPU: 0 PID: 3038 Comm: syz-executor478 Not tainted 6.0.0-rc3-syzkaller-16800-g85413d1e802e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 Call trace: dump_backtrace+0x1b0/0x1dc arch/arm64/kernel/stacktrace.c:182 show_stack+0x2c/0x64 arch/arm64/kernel/stacktrace.c:189 __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:818 el1_abort+0x3c/0x5c arch/arm64/kernel/entry-common.c:366 el1h_64_sync_handler+0x5c/0x98 arch/arm64/kernel/entry-common.c:417 el1h_64_sync+0x64/0x68 __lock_acquire+0x60/0x30a4 kernel/locking/lockdep.c:4923 lock_acquire+0x100/0x1f8 kernel/locking/lockdep.c:5666 down_read+0x5c/0x78 kernel/locking/rwsem.c:1499 mmap_read_lock include/linux/mmap_lock.h:117 [inline] binder_alloc_print_pages+0x48/0x218 drivers/android/binder_alloc.c:936 print_binder_proc_stats drivers/android/binder.c:6289 [inline] stats_show+0x2d8/0x3e0 drivers/android/binder.c:6352 seq_read_iter+0x220/0x5e0 fs/seq_file.c:230 seq_read+0x98/0xd0 fs/seq_file.c:162 full_proxy_read+0x94/0x140 fs/debugfs/file.c:231 vfs_read+0x19c/0x448 fs/read_write.c:468 ksys_read+0xb4/0x160 fs/read_write.c:607 __do_sys_read fs/read_write.c:617 [inline] __se_sys_read fs/read_write.c:615 [inline] __arm64_sys_read+0x24/0x34 fs/read_write.c:615 __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+0x48/0x154 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:624 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:642 el0t_64_sync+0x18c/0x190 ============================= WARNING: suspicious RCU usage 6.0.0-rc3-syzkaller-16800-g85413d1e802e #0 Not tainted ----------------------------- 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 3 locks held by syz-executor478/3038: #0: ffff0000c90e7188 (&p->lock){+.+.}-{3:3}, at: seq_read_iter+0x5c/0x5e0 fs/seq_file.c:182 #1: ffff80000d82d328 (binder_procs_lock){+.+.}-{3:3}, at: stats_show+0x60/0x3e0 drivers/android/binder.c:6350 #2: ffff0000c937aa48 (&alloc->mutex){+.+.}-{3:3}, at: binder_alloc_print_pages+0x38/0x218 drivers/android/binder_alloc.c:930 stack backtrace: CPU: 0 PID: 3038 Comm: syz-executor478 Not tainted 6.0.0-rc3-syzkaller-16800-g85413d1e802e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 Call trace: dump_backtrace+0x1b0/0x1dc arch/arm64/kernel/stacktrace.c:182 show_stack+0x2c/0x64 arch/arm64/kernel/stacktrace.c:189 __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:818 el1_abort+0x3c/0x5c arch/arm64/kernel/entry-common.c:366 el1h_64_sync_handler+0x5c/0x98 arch/arm64/kernel/entry-common.c:417 el1h_64_sync+0x64/0x68 __lock_acquire+0x60/0x30a4 kernel/locking/lockdep.c:4923 lock_acquire+0x100/0x1f8 kernel/locking/lockdep.c:5666 down_read+0x5c/0x78 kernel/locking/rwsem.c:1499 mmap_read_lock include/linux/mmap_lock.h:117 [inline] binder_alloc_print_pages+0x48/0x218 drivers/android/binder_alloc.c:936 print_binder_proc_stats drivers/android/binder.c:6289 [inline] stats_show+0x2d8/0x3e0 drivers/android/binder.c:6352 seq_read_iter+0x220/0x5e0 fs/seq_file.c:230 seq_read+0x98/0xd0 fs/seq_file.c:162 full_proxy_read+0x94/0x140 fs/debugfs/file.c:231 vfs_read+0x19c/0x448 fs/read_write.c:468 ksys_read+0xb4/0x160 fs/read_write.c:607 __do_sys_read fs/read_write.c:617 [inline] __se_sys_read fs/read_write.c:615 [inline] __arm64_sys_read+0x24/0x34 fs/read_write.c:615 __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+0x48/0x154 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:624 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:642 el0t_64_sync+0x18c/0x190 BUG: sleeping function called from invalid context at arch/arm64/mm/fault.c:593 in_atomic(): 0, irqs_disabled(): 128, non_block: 0, pid: 3038, name: syz-executor478 preempt_count: 0, expected: 0 RCU nest depth: 0, expected: 0 3 locks held by syz-executor478/3038: #0: ffff0000c90e7188 (&p->lock){+.+.}-{3:3}, at: seq_read_iter+0x5c/0x5e0 fs/seq_file.c:182 #1: ffff80000d82d328 (binder_procs_lock){+.+.}-{3:3}, at: stats_show+0x60/0x3e0 drivers/android/binder.c:6350 #2: ffff0000c937aa48 (&alloc->mutex){+.+.}-{3:3}, at: binder_alloc_print_pages+0x38/0x218 drivers/android/binder_alloc.c:930 irq event stamp: 519 hardirqs last enabled at (519): [<ffff800008038c9c>] local_daif_restore arch/arm64/include/asm/daifflags.h:75 [inline] hardirqs last enabled at (519): [<ffff800008038c9c>] el0_svc_common+0x40/0x220 arch/arm64/kernel/syscall.c:107 hardirqs last disabled at (518): [<ffff80000c001358>] el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:642 softirqs last enabled at (504): [<ffff8000080102e4>] _stext+0x2e4/0x37c softirqs last disabled at (495): [<ffff800008104658>] do_softirq_own_stack include/asm-generic/softirq_stack.h:10 [inline] softirqs last disabled at (495): [<ffff800008104658>] invoke_softirq+0x70/0xbc kernel/softirq.c:452 CPU: 0 PID: 3038 Comm: syz-executor478 Not tainted 6.0.0-rc3-syzkaller-16800-g85413d1e802e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 Call trace: dump_backtrace+0x1b0/0x1dc arch/arm64/kernel/stacktrace.c:182 show_stack+0x2c/0x64 arch/arm64/kernel/stacktrace.c:189 __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:818 el1_abort+0x3c/0x5c arch/arm64/kernel/entry-common.c:366 el1h_64_sync_handler+0x5c/0x98 arch/arm64/kernel/entry-common.c:417 el1h_64_sync+0x64/0x68 __lock_acquire+0x60/0x30a4 kernel/locking/lockdep.c:4923 lock_acquire+0x100/0x1f8 kernel/locking/lockdep.c:5666 down_read+0x5c/0x78 kernel/locking/rwsem.c:1499 mmap_read_lock include/linux/mmap_lock.h:117 [inline] binder_alloc_print_pages+0x48/0x218 drivers/android/binder_alloc.c:936 print_binder_proc_stats drivers/android/binder.c:6289 [inline] stats_show+0x2d8/0x3e0 drivers/android/binder.c:6352 seq_read_iter+0x220/0x5e0 fs/seq_file.c:230 seq_read+0x98/0xd0 fs/seq_file.c:162 full_proxy_read+0x94/0x140 fs/debugfs/file.c:231 vfs_read+0x19c/0x448 fs/read_write.c:468 ksys_read+0xb4/0x160 fs/read_write.c:607 __do_sys_read fs/read_write.c:617 [inline] __se_sys_read fs/read_write.c:615 [inline] __arm64_sys_read+0x24/0x34 fs/read_write.c:615 __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+0x48/0x154 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:624 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:642 el0t_64_sync+0x18c/0x190 Unable to handle kernel NULL pointer dereference at virtual address 0000000000000118 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=000000010c4fd000 [0000000000000118] pgd=080000010c4cd003, p4d=080000010c4cd003, pud=080000010c4cc003, pmd=0000000000000000 Internal error: Oops: 96000006 [#1] PREEMPT SMP Modules linked in: CPU: 0 PID: 3038 Comm: syz-executor478 Tainted: G W 6.0.0-rc3-syzkaller-16800-g85413d1e802e #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022 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 : ffff8000126e38c0 x29: ffff8000126e39a0 x28: 0000000000000000 x27: 0000000000000000 x26: 0000000000000118 x25: ffff80000aff1fcc x24: 0000000000000000 x23: 0000000000000000 x22: 0000000000000118 x21: 0000000000000000 x20: 0000000000000001 x19: 0000000000000000 x18: 00000000000000c0 x17: ffff80000dd7a698 x16: ffff80000dbb8658 x15: ffff0000c4a2b500 x14: 00000000000000b8 x13: 00000000ffffffff x12: ffff0000c4a2b500 x11: ff808000095ecde4 x10: 0000000000000000 x9 : 0000000000000001 x8 : 0000000000000001 x7 : ffff80000aff1fcc x6 : 0000000000000000 x5 : 0000000000000000 x4 : 0000000000000001 x3 : 0000000000000001 x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000000000118 Call trace: __lock_acquire+0x60/0x30a4 kernel/locking/lockdep.c:4923 lock_acquire+0x100/0x1f8 kernel/locking/lockdep.c:5666 down_read+0x5c/0x78 kernel/locking/rwsem.c:1499 mmap_read_lock include/linux/mmap_lock.h:117 [inline] binder_alloc_print_pages+0x48/0x218 drivers/android/binder_alloc.c:936 print_binder_proc_stats drivers/android/binder.c:6289 [inline] stats_show+0x2d8/0x3e0 drivers/android/binder.c:6352 seq_read_iter+0x220/0x5e0 fs/seq_file.c:230 seq_read+0x98/0xd0 fs/seq_file.c:162 full_proxy_read+0x94/0x140 fs/debugfs/file.c:231 vfs_read+0x19c/0x448 fs/read_write.c:468 ksys_read+0xb4/0x160 fs/read_write.c:607 __do_sys_read fs/read_write.c:617 [inline] __se_sys_read fs/read_write.c:615 [inline] __arm64_sys_read+0x24/0x34 fs/read_write.c:615 __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+0x48/0x154 arch/arm64/kernel/syscall.c:206 el0_svc+0x58/0x150 arch/arm64/kernel/entry-common.c:624 el0t_64_sync_handler+0x84/0xf0 arch/arm64/kernel/entry-common.c:642 el0t_64_sync+0x18c/0x190 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 --- This report is generated by a bot. It may contain errors. See https://goo.gl/tpsmEJ for more information about syzbot. syzbot engineers can be reached at syzkaller@xxxxxxxxxxxxxxxx. syzbot will keep track of this issue. See: https://goo.gl/tpsmEJ#status for how to communicate with syzbot. syzbot can test patches for this issue, for details see: https://goo.gl/tpsmEJ#testing-patches
