Hello, syzbot found the following issue on: HEAD commit: 431c1646e1f8 Linux 6.11-rc6 git tree: upstream console output: https://syzkaller.appspot.com/x/log.txt?x=1180c51f980000 kernel config: https://syzkaller.appspot.com/x/.config?x=660f6eb11f9c7dc5 dashboard link: https://syzkaller.appspot.com/bug?extid=265e1cae90f8fa08f14d compiler: Debian clang version 15.0.6, GNU ld (GNU Binutils for Debian) 2.40 syz repro: https://syzkaller.appspot.com/x/repro.syz?x=16f8f0fb980000 Downloadable assets: disk image: https://storage.googleapis.com/syzbot-assets/7c5410bf1e32/disk-431c1646.raw.xz vmlinux: https://storage.googleapis.com/syzbot-assets/33cf738f4211/vmlinux-431c1646.xz kernel image: https://storage.googleapis.com/syzbot-assets/5219f1401ba0/bzImage-431c1646.xz IMPORTANT: if you fix the issue, please add the following tag to the commit: Reported-by: syzbot+265e1cae90f8fa08f14d@xxxxxxxxxxxxxxxxxxxxxxxxx INFO: task syz.2.113:5685 blocked for more than 143 seconds. Not tainted 6.11.0-rc6-syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.2.113 state:D stack:26288 pid:5685 tgid:5684 ppid:5366 flags:0x00000004 Call Trace: <TASK> context_switch kernel/sched/core.c:5188 [inline] __schedule+0x1800/0x4a60 kernel/sched/core.c:6529 __schedule_loop kernel/sched/core.c:6606 [inline] schedule+0x14b/0x320 kernel/sched/core.c:6621 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:6678 rwsem_down_read_slowpath kernel/locking/rwsem.c:1086 [inline] __down_read_common kernel/locking/rwsem.c:1250 [inline] __down_read kernel/locking/rwsem.c:1263 [inline] down_read+0x705/0xa40 kernel/locking/rwsem.c:1528 filemap_invalidate_lock_shared include/linux/fs.h:855 [inline] page_cache_ra_unbounded+0xf7/0x7f0 mm/readahead.c:225 do_sync_mmap_readahead+0x49c/0x970 filemap_fault+0x828/0x1760 mm/filemap.c:3314 __do_fault+0x135/0x460 mm/memory.c:4655 do_read_fault mm/memory.c:5061 [inline] do_fault mm/memory.c:5191 [inline] do_pte_missing mm/memory.c:3947 [inline] handle_pte_fault+0x321f/0x6fc0 mm/memory.c:5521 __handle_mm_fault mm/memory.c:5664 [inline] handle_mm_fault+0x1109/0x1bc0 mm/memory.c:5832 do_user_addr_fault arch/x86/mm/fault.c:1389 [inline] handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x2b9/0x8c0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0010:do_strncpy_from_user lib/strncpy_from_user.c:41 [inline] RIP: 0010:strncpy_from_user+0x110/0x2e0 lib/strncpy_from_user.c:139 Code: 00 00 00 4c 89 e6 e8 4f ea a7 fc 49 83 fc 07 0f 86 9a 00 00 00 48 89 6c 24 08 48 c7 44 24 10 f8 ff ff ff 45 31 ed 4c 89 3c 24 <4f> 8b 3c 2f 48 b8 ff fe fe fe fe fe fe fe 49 8d 1c 07 4c 89 fd 48 RSP: 0018:ffffc90002ecfca8 EFLAGS: 00050246 RAX: 0000000000000000 RBX: ffff8880123f9100 RCX: ffff888064d11e00 RDX: 0000000000000000 RSI: 0000000000000fe0 RDI: 0000000000000007 RBP: 0000000000000fe0 R08: ffffffff84eba6c1 R09: 1ffffffff2030de5 R10: dffffc0000000000 R11: fffffbfff2030de6 R12: 0000000000000fe0 R13: 0000000000000000 R14: ffff8880123f9120 R15: 0000000020001000 getname_flags+0xf1/0x540 fs/namei.c:150 do_sys_openat2+0xd2/0x1d0 fs/open.c:1410 do_sys_open fs/open.c:1431 [inline] __do_sys_openat fs/open.c:1447 [inline] __se_sys_openat fs/open.c:1442 [inline] __x64_sys_openat+0x247/0x2a0 fs/open.c:1442 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f4936579eb9 RSP: 002b:00007f4937376038 EFLAGS: 00000246 ORIG_RAX: 0000000000000101 RAX: ffffffffffffffda RBX: 00007f4936715f80 RCX: 00007f4936579eb9 RDX: 0000000000048882 RSI: 0000000020001000 RDI: ffffffffffffff9c RBP: 00007f49365e793e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 0000000000000001 R14: 00007f4936715f80 R15: 00007ffe88d6c3d8 </TASK> Showing all locks held in the system: 1 lock held by khungtaskd/30: #0: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: rcu_lock_acquire include/linux/rcupdate.h:326 [inline] #0: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: rcu_read_lock include/linux/rcupdate.h:838 [inline] #0: ffffffff8e938320 (rcu_read_lock){....}-{1:2}, at: debug_show_all_locks+0x55/0x2a0 kernel/locking/lockdep.c:6626 2 locks held by getty/4993: #0: ffff8880334080a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc900031332f0 (&ldata->atomic_read_lock){+.+.}-{3:3}, at: n_tty_read+0x6ac/0x1e00 drivers/tty/n_tty.c:2211 3 locks held by kworker/u8:3/5350: 1 lock held by syz.1.16/5487: 1 lock held by syz.2.113/5685: #0: ffff888023142040 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:855 [inline] #0: ffff888023142040 (mapping.invalidate_lock#2){++++}-{3:3}, at: page_cache_ra_unbounded+0xf7/0x7f0 mm/readahead.c:225 1 lock held by syz.3.563/6608: #0: ffff888023142040 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:855 [inline] #0: ffff888023142040 (mapping.invalidate_lock#2){++++}-{3:3}, at: page_cache_ra_unbounded+0xf7/0x7f0 mm/readahead.c:225 1 lock held by syz.4.969/7439: #0: ffff888023142040 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:855 [inline] #0: ffff888023142040 (mapping.invalidate_lock#2){++++}-{3:3}, at: page_cache_ra_unbounded+0xf7/0x7f0 mm/readahead.c:225 1 lock held by syz.3.1736/9003: #0: ffff888023142040 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:855 [inline] #0: ffff888023142040 (mapping.invalidate_lock#2){++++}-{3:3}, at: page_cache_ra_unbounded+0xf7/0x7f0 mm/readahead.c:225 1 lock held by syz.1.2635/10912: #0: ffff888023142040 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:855 [inline] #0: ffff888023142040 (mapping.invalidate_lock#2){++++}-{3:3}, at: page_cache_ra_unbounded+0xf7/0x7f0 mm/readahead.c:225 3 locks held by syz-executor/11416: 1 lock held by syz.4.3267/12287: #0: ffff888023142040 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:855 [inline] #0: ffff888023142040 (mapping.invalidate_lock#2){++++}-{3:3}, at: page_cache_ra_unbounded+0xf7/0x7f0 mm/readahead.c:225 1 lock held by syz.0.3382/12588: #0: ffff888023142040 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:855 [inline] #0: ffff888023142040 (mapping.invalidate_lock#2){++++}-{3:3}, at: page_cache_ra_unbounded+0xf7/0x7f0 mm/readahead.c:225 5 locks held by syz-executor/12700: 1 lock held by syz.2.3654/13168: #0: ffff888023142040 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:855 [inline] #0: ffff888023142040 (mapping.invalidate_lock#2){++++}-{3:3}, at: page_cache_ra_unbounded+0xf7/0x7f0 mm/readahead.c:225 1 lock held by syz.0.4112/14111: #0: ffff888023142040 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:855 [inline] #0: ffff888023142040 (mapping.invalidate_lock#2){++++}-{3:3}, at: page_cache_ra_unbounded+0xf7/0x7f0 mm/readahead.c:225 7 locks held by syz-executor/14848: #0: ffff888035396420 (sb_writers#8){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2882 [inline] #0: ffff888035396420 (sb_writers#8){.+.+}-{0:0}, at: vfs_write+0x227/0xc90 fs/read_write.c:586 #1: ffff88805844fc88 (&of->mutex){+.+.}-{3:3}, at: kernfs_fop_write_iter+0x1eb/0x500 fs/kernfs/file.c:325 #2: ffff8880285c7788 (kn->active#56){.+.+}-{0:0}, at: kernfs_fop_write_iter+0x20f/0x500 fs/kernfs/file.c:326 #3: ffffffff8f526348 (nsim_bus_dev_list_lock){+.+.}-{3:3}, at: del_device_store+0xfc/0x480 drivers/net/netdevsim/bus.c:216 #4: ffff888011c460e8 (&dev->mutex){....}-{3:3}, at: device_lock include/linux/device.h:1009 [inline] #4: ffff888011c460e8 (&dev->mutex){....}-{3:3}, at: __device_driver_lock drivers/base/dd.c:1094 [inline] #4: ffff888011c460e8 (&dev->mutex){....}-{3:3}, at: device_release_driver_internal+0xce/0x7c0 drivers/base/dd.c:1292 #5: ffff888011c42250 (&devlink->lock_key#16){+.+.}-{3:3}, at: nsim_drv_remove+0x50/0x160 drivers/net/netdevsim/dev.c:1672 #6: ffffffff8e93d5c0 (rcu_state.barrier_mutex){+.+.}-{3:3}, at: rcu_barrier+0x4c/0x530 kernel/rcu/tree.c:4486 1 lock held by syz.4.4645/15192: #0: ffff888023142040 (mapping.invalidate_lock#2){++++}-{3:3}, at: filemap_invalidate_lock_shared include/linux/fs.h:855 [inline] #0: ffff888023142040 (mapping.invalidate_lock#2){++++}-{3:3}, at: page_cache_ra_unbounded+0xf7/0x7f0 mm/readahead.c:225 1 lock held by syz.1.4651/15207: 1 lock held by syz.3.4652/15213: #0: ffff8880b883e9d8 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x2a/0x140 kernel/sched/core.c:560 ============================================= NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 30 Comm: khungtaskd Not tainted 6.11.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 Call Trace: <TASK> __dump_stack lib/dump_stack.c:93 [inline] dump_stack_lvl+0x241/0x360 lib/dump_stack.c:119 nmi_cpu_backtrace+0x49c/0x4d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x198/0x320 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline] check_hung_uninterruptible_tasks kernel/hung_task.c:223 [inline] watchdog+0xff4/0x1040 kernel/hung_task.c:379 kthread+0x2f0/0x390 kernel/kthread.c:389 ret_from_fork+0x4b/0x80 arch/x86/kernel/process.c:147 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 </TASK> Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 15219 Comm: syz.2.4658 Not tainted 6.11.0-rc6-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/06/2024 RIP: 0010:check_kcov_mode kernel/kcov.c:193 [inline] RIP: 0010:__sanitizer_cov_trace_pc+0x37/0x70 kernel/kcov.c:216 Code: 00 d7 03 00 65 8b 15 c0 4a 70 7e 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 35 83 b9 1c 16 00 00 00 74 2c 8b 91 f8 15 00 00 <83> fa 02 75 21 48 8b 91 00 16 00 00 48 8b 32 48 8d 7e 01 8b 89 fc RSP: 0000:ffffc9000b01f0e0 EFLAGS: 00000246 RAX: ffffffff81412c81 RBX: ffffffff90310d08 RCX: ffff88805902da00 RDX: 0000000000000000 RSI: ffffffff81facfcf RDI: ffffffff81facf80 RBP: ffffffff81facf80 R08: ffffffff81412c60 R09: ffffc9000b01f2b0 R10: 0000000000000003 R11: ffffffff817f2f00 R12: ffffffff90310d0c R13: ffffffff90310d0c R14: ffffffff81facfcf R15: ffffffff90310d08 FS: 000055556a623500(0000) GS:ffff8880b8800000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000001b30b20000 CR3: 000000007c78e000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <NMI> </NMI> <TASK> __orc_find arch/x86/kernel/unwind_orc.c:99 [inline] orc_find arch/x86/kernel/unwind_orc.c:227 [inline] unwind_next_frame+0x531/0x2a00 arch/x86/kernel/unwind_orc.c:494 arch_stack_walk+0x151/0x1b0 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0x118/0x1d0 kernel/stacktrace.c:122 kasan_save_stack mm/kasan/common.c:47 [inline] kasan_save_track+0x3f/0x80 mm/kasan/common.c:68 kasan_save_free_info+0x40/0x50 mm/kasan/generic.c:579 poison_slab_object+0xe0/0x150 mm/kasan/common.c:240 __kasan_slab_free+0x37/0x60 mm/kasan/common.c:256 kasan_slab_free include/linux/kasan.h:184 [inline] slab_free_hook mm/slub.c:2252 [inline] slab_free mm/slub.c:4473 [inline] kmem_cache_free+0x145/0x350 mm/slub.c:4548 jbd2_free_handle include/linux/jbd2.h:1608 [inline] jbd2_journal_stop+0x902/0xd80 fs/jbd2/transaction.c:1958 __ext4_journal_stop+0xfd/0x1a0 fs/ext4/ext4_jbd2.c:134 __mark_inode_dirty+0x325/0xe20 fs/fs-writeback.c:2486 generic_update_time fs/inode.c:2004 [inline] inode_update_time fs/inode.c:2017 [inline] __file_update_time fs/inode.c:2206 [inline] file_update_time+0x3ad/0x430 fs/inode.c:2236 ext4_page_mkwrite+0x207/0xdf0 fs/ext4/inode.c:6132 do_page_mkwrite+0x19b/0x480 mm/memory.c:3142 do_shared_fault mm/memory.c:5133 [inline] do_fault mm/memory.c:5195 [inline] do_pte_missing mm/memory.c:3947 [inline] handle_pte_fault+0x126b/0x6fc0 mm/memory.c:5521 __handle_mm_fault mm/memory.c:5664 [inline] handle_mm_fault+0x1109/0x1bc0 mm/memory.c:5832 do_user_addr_fault arch/x86/mm/fault.c:1338 [inline] handle_page_fault arch/x86/mm/fault.c:1481 [inline] exc_page_fault+0x459/0x8c0 arch/x86/mm/fault.c:1539 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623 RIP: 0033:0x7fd06384da54 Code: 20 00 48 89 df 74 e7 e8 4a c4 ff ff 84 c0 74 d7 80 3d 48 a0 2c 00 00 48 8b 83 a8 00 00 00 75 be 8b 00 89 83 9c 00 00 00 eb bd <89> 32 e9 dc f1 ff ff 64 f0 83 04 25 90 ff ff ff 01 64 48 8b 04 25 RSP: 002b:00007ffc184e8510 EFLAGS: 00010246 RAX: 000000000003fdf0 RBX: 0000000000000000 RCX: 0000000000000000 RDX: 0000001b30b20000 RSI: 0000000000040000 RDI: 00007fd063a68bd0 RBP: 00007ffc184e876c R08: 000000000000000a R09: 00007ffc184e8254 R10: 0000000000000001 R11: 0000000000000293 R12: 0000000000000032 R13: 00000000000895cf R14: 00000000000895ac R15: 00007ffc184e87c0 </TASK> --- 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. If the report is already addressed, let syzbot know by replying with: #syz fix: exact-commit-title If you want syzbot to run the reproducer, reply with: #syz test: git://repo/address.git branch-or-commit-hash If you attach or paste a git patch, syzbot will apply it before testing. If you want to overwrite report's subsystems, reply with: #syz set subsystems: new-subsystem (See the list of subsystem names on the web dashboard) If the report is a duplicate of another one, reply with: #syz dup: exact-subject-of-another-report If you want to undo deduplication, reply with: #syz undup
