INFO: task syz.0.3215:20938 blocked for more than 143 seconds.
      Not tainted 6.15.0-rc3-syzkaller-00019-gbc3372351d0c #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.3215      state:D stack:19176 pid:20938 tgid:20938 ppid:18037  task_flags:0x400640 flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x116f/0x5de0 kernel/sched/core.c:6767
 __schedule_loop kernel/sched/core.c:6845 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:6860
 io_schedule+0xbf/0x130 kernel/sched/core.c:7742
 folio_wait_bit_common+0x3d6/0x9e0 mm/filemap.c:1317
 __folio_lock mm/filemap.c:1664 [inline]
 lock_folio_maybe_drop_mmap mm/filemap.c:3190 [inline]
 filemap_fault+0xd62/0x2740 mm/filemap.c:3424
 __do_fault+0x10a/0x490 mm/memory.c:5098
 do_read_fault mm/memory.c:5518 [inline]
 do_fault mm/memory.c:5652 [inline]
 do_pte_missing+0x1031/0x3fb0 mm/memory.c:4160
 handle_pte_fault mm/memory.c:5997 [inline]
 __handle_mm_fault+0x103d/0x2a40 mm/memory.c:6140
 handle_mm_fault+0x3fe/0xad0 mm/memory.c:6309
 faultin_page mm/gup.c:1193 [inline]
 __get_user_pages+0x771/0x36f0 mm/gup.c:1491
 __get_user_pages_locked mm/gup.c:1757 [inline]
 get_dump_page+0x257/0x3d0 mm/gup.c:2275
 dump_user_range+0x1c3/0xb30 fs/coredump.c:953
 elf_core_dump+0x288a/0x3a90 fs/binfmt_elf.c:2128
 do_coredump+0x3183/0x4480 fs/coredump.c:759
 get_signal+0x22e3/0x26d0 kernel/signal.c:3019
 arch_do_signal_or_restart+0x8f/0x7a0 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 irqentry_exit_to_user_mode+0x13f/0x280 kernel/entry/common.c:231
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x44fff
RSP: 002b:0000000000000009 EFLAGS: 00010206
RAX: 0000000000000000 RBX: 00007f7a42bb5fa0 RCX: 00007f7a4298e169
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000020003b46
RBP: 00007f7a42a10a68 R08: 0000000000000003 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 00007f7a42bb5fa0 R15: 00007ffe6d7cc068
 </TASK>
INFO: task syz.0.3226:20989 blocked for more than 143 seconds.
      Not tainted 6.15.0-rc3-syzkaller-00019-gbc3372351d0c #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.0.3226      state:D stack:18264 pid:20989 tgid:20989 ppid:18037  task_flags:0x400640 flags:0x00004002
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x116f/0x5de0 kernel/sched/core.c:6767
 __schedule_loop kernel/sched/core.c:6845 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:6860
 io_schedule+0xbf/0x130 kernel/sched/core.c:7742
 folio_wait_bit_common+0x3d6/0x9e0 mm/filemap.c:1317
 __folio_lock mm/filemap.c:1664 [inline]
 lock_folio_maybe_drop_mmap mm/filemap.c:3190 [inline]
 filemap_fault+0xd62/0x2740 mm/filemap.c:3424
 __do_fault+0x10a/0x490 mm/memory.c:5098
 do_read_fault mm/memory.c:5518 [inline]
 do_fault mm/memory.c:5652 [inline]
 do_pte_missing+0x1031/0x3fb0 mm/memory.c:4160
 handle_pte_fault mm/memory.c:5997 [inline]
 __handle_mm_fault+0x103d/0x2a40 mm/memory.c:6140
 handle_mm_fault+0x3fe/0xad0 mm/memory.c:6309
 faultin_page mm/gup.c:1193 [inline]
 __get_user_pages+0x771/0x36f0 mm/gup.c:1491
 __get_user_pages_locked mm/gup.c:1757 [inline]
 get_dump_page+0x257/0x3d0 mm/gup.c:2275
 dump_user_range+0x1c3/0xb30 fs/coredump.c:953
 elf_core_dump+0x288a/0x3a90 fs/binfmt_elf.c:2128
 do_coredump+0x3183/0x4480 fs/coredump.c:759
 get_signal+0x22e3/0x26d0 kernel/signal.c:3019
 arch_do_signal_or_restart+0x8f/0x7a0 arch/x86/kernel/signal.c:337
 exit_to_user_mode_loop kernel/entry/common.c:111 [inline]
 exit_to_user_mode_prepare include/linux/entry-common.h:329 [inline]
 __syscall_exit_to_user_mode_work kernel/entry/common.c:207 [inline]
 syscall_exit_to_user_mode+0x150/0x2a0 kernel/entry/common.c:218
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
INFO: task syz.3.3263:21154 blocked for more than 144 seconds.
      Not tainted 6.15.0-rc3-syzkaller-00019-gbc3372351d0c #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.3.3263      state:D stack:28344 pid:21154 tgid:21154 ppid:17700  task_flags:0x440040 flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x116f/0x5de0 kernel/sched/core.c:6767
 __schedule_loop kernel/sched/core.c:6845 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:6860
 io_schedule+0xbf/0x130 kernel/sched/core.c:7742
 bit_wait_io+0x15/0xe0 kernel/sched/wait_bit.c:247
 __wait_on_bit+0x62/0x180 kernel/sched/wait_bit.c:49
 out_of_line_wait_on_bit+0xd9/0x110 kernel/sched/wait_bit.c:64
 wait_on_bit_io include/linux/wait_bit.h:105 [inline]
 do_get_write_access+0x93d/0x12a0 fs/jbd2/transaction.c:1092
 jbd2_journal_get_write_access+0x1d6/0x280 fs/jbd2/transaction.c:1241
 __ext4_journal_get_write_access+0x6a/0x340 fs/ext4/ext4_jbd2.c:241
 ext4_reserve_inode_write+0x1be/0x320 fs/ext4/inode.c:5892
 __ext4_mark_inode_dirty+0x197/0x870 fs/ext4/inode.c:6066
 ext4_dirty_inode+0xd9/0x130 fs/ext4/inode.c:6103
 __mark_inode_dirty+0x1eb/0xe50 fs/fs-writeback.c:2527
 generic_update_time+0xcf/0xf0 fs/inode.c:2064
 inode_update_time fs/inode.c:2077 [inline]
 __file_update_time fs/inode.c:2305 [inline]
 file_update_time+0x17d/0x1c0 fs/inode.c:2335
 ext4_page_mkwrite+0x35e/0x1750 fs/ext4/inode.c:6221
 do_page_mkwrite+0x171/0x380 mm/memory.c:3287
 do_shared_fault mm/memory.c:5594 [inline]
 do_fault mm/memory.c:5656 [inline]
 do_pte_missing+0x29c/0x3fb0 mm/memory.c:4160
 handle_pte_fault mm/memory.c:5997 [inline]
 __handle_mm_fault+0x103d/0x2a40 mm/memory.c:6140
 handle_mm_fault+0x3fe/0xad0 mm/memory.c:6309
 do_user_addr_fault+0x60c/0x1370 arch/x86/mm/fault.c:1337
 handle_page_fault arch/x86/mm/fault.c:1480 [inline]
 exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1538
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7f7f04a6e2fa
RSP: 002b:00007ffffd3b5af0 EFLAGS: 00010202
RAX: 0000001b2db09000 RBX: 00007f7f058e5720 RCX: 0000001b2db08ff8
RDX: 0000001b2d720220 RSI: 0000000000000008 RDI: 00007f7f058e5720
RBP: ffffffff89452be5 R08: 00007f7f04db6038 R09: 00007f7f04da2000
R10: 00007f7f041ff008 R11: 000000000000000f R12: 000000000000000f
R13: 00000000000001e5 R14: ffffffff894524a9 R15: 000000000000020e
 </TASK>
INFO: task syz.1.3264:21158 blocked for more than 144 seconds.
      Not tainted 6.15.0-rc3-syzkaller-00019-gbc3372351d0c #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.3264      state:D stack:26488 pid:21158 tgid:21158 ppid:16703  task_flags:0x440040 flags:0x00000004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5382 [inline]
 __schedule+0x116f/0x5de0 kernel/sched/core.c:6767
 __schedule_loop kernel/sched/core.c:6845 [inline]
 schedule+0xe7/0x3a0 kernel/sched/core.c:6860
 io_schedule+0xbf/0x130 kernel/sched/core.c:7742
 bit_wait_io+0x15/0xe0 kernel/sched/wait_bit.c:247
 __wait_on_bit+0x62/0x180 kernel/sched/wait_bit.c:49
 out_of_line_wait_on_bit+0xd9/0x110 kernel/sched/wait_bit.c:64
 wait_on_bit_io include/linux/wait_bit.h:105 [inline]
 do_get_write_access+0x93d/0x12a0 fs/jbd2/transaction.c:1092
 jbd2_journal_get_write_access+0x1d6/0x280 fs/jbd2/transaction.c:1241
 __ext4_journal_get_write_access+0x6a/0x340 fs/ext4/ext4_jbd2.c:241
 ext4_reserve_inode_write+0x1be/0x320 fs/ext4/inode.c:5892
 __ext4_mark_inode_dirty+0x197/0x870 fs/ext4/inode.c:6066
 ext4_dirty_inode+0xd9/0x130 fs/ext4/inode.c:6103
 __mark_inode_dirty+0x1eb/0xe50 fs/fs-writeback.c:2527
 generic_update_time+0xcf/0xf0 fs/inode.c:2064
 inode_update_time fs/inode.c:2077 [inline]
 __file_update_time fs/inode.c:2305 [inline]
 file_update_time+0x17d/0x1c0 fs/inode.c:2335
 ext4_page_mkwrite+0x35e/0x1750 fs/ext4/inode.c:6221
 do_page_mkwrite+0x171/0x380 mm/memory.c:3287
 do_shared_fault mm/memory.c:5594 [inline]
 do_fault mm/memory.c:5656 [inline]
 do_pte_missing+0x29c/0x3fb0 mm/memory.c:4160
 handle_pte_fault mm/memory.c:5997 [inline]
 __handle_mm_fault+0x103d/0x2a40 mm/memory.c:6140
 handle_mm_fault+0x3fe/0xad0 mm/memory.c:6309
 do_user_addr_fault+0x60c/0x1370 arch/x86/mm/fault.c:1337
 handle_page_fault arch/x86/mm/fault.c:1480 [inline]
 exc_page_fault+0x5c/0xc0 arch/x86/mm/fault.c:1538
 asm_exc_page_fault+0x26/0x30 arch/x86/include/asm/idtentry.h:623
RIP: 0033:0x7fe14c26e2fa
RSP: 002b:00007ffd039b8340 EFLAGS: 00010202
RAX: 0000001b2effa000 RBX: 00007fe14d0e5720 RCX: 0000001b2eff9ff8
RDX: 0000001b2ec20220 RSI: 0000000000000008 RDI: 00007fe14d0e5720
RBP: ffffffff893d78b9 R08: 00007fe14c5b6118 R09: 00007fe14c5a2000
R10: 00007fe14b5fd008 R11: 000000000000001d R12: 000000000000001d
R13: 00000000000000de R14: ffffffff893d7440 R15: 000000000000012d
 </TASK>

Showing all locks held in the system:
3 locks held by kworker/u8:2/30:
 #0: ffff8880b8539f18 (&rq->__lock){-.-.}-{2:2}, at: raw_spin_rq_lock_nested+0x29/0x130 kernel/sched/core.c:605
 #1: ffffc90000a57d18 ((work_completion)(&(&bat_priv->mcast.work)->work)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3214
 #2: ffffffff9adacbf8 (&obj_hash[i].lock){-.-.}-{2:2}, at: debug_object_deactivate+0x135/0x3a0 lib/debugobjects.c:873
1 lock held by khungtaskd/32:
 #0: ffffffff8e3bf440 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:331 [inline]
 #0: ffffffff8e3bf440 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:841 [inline]
 #0: ffffffff8e3bf440 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x36/0x1c0 kernel/locking/lockdep.c:6764
1 lock held by syz-executor/5826:
 #0: ffff88807a763760 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:922 [inline]
 #0: ffff88807a763760 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_fault+0x2d8/0x2740 mm/filemap.c:3391
6 locks held by kworker/u8:3/16561:
 #0: ffff888021a8c148 ((wq_completion)writeback){+.+.}-{0:0}, at: process_one_work+0x12a2/0x1b70 kernel/workqueue.c:3213
 #1: ffffc9000b1f7d18 ((work_completion)(&(&wb->dwork)->work)){+.+.}-{0:0}, at: process_one_work+0x929/0x1b70 kernel/workqueue.c:3214
 #2: ffff88814e8260e0 (&type->s_umount_key#31){++++}-{4:4}, at: super_trylock_shared+0x1e/0xf0 fs/super.c:562
 #3: ffff88814e828b98 (&sbi->s_writepages_rwsem){++++}-{0:0}, at: do_writepages+0x1b2/0x820 mm/page-writeback.c:2656
 #4: ffff88814e82a950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x5e4/0x1410 fs/jbd2/transaction.c:444
 #5: ffff88807a764820 (&ei->i_data_sem){++++}-{4:4}, at: ext4_map_blocks+0x355/0x1390 fs/ext4/inode.c:705
2 locks held by getty/17932:
 #0: ffff88803185e0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x24/0x80 drivers/tty/tty_ldisc.c:243
 #1: ffffc900033362f0 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x41b/0x14f0 drivers/tty/n_tty.c:2222
3 locks held by syz.0.3215/20938:
 #0: ffff888060ed4420 (sb_writers#5){.+.+}-{0:0}, at: get_signal+0x22e3/0x26d0 kernel/signal.c:3019
 #1: ffff888079288be0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock_killable include/linux/mmap_lock.h:193 [inline]
 #1: ffff888079288be0 (&mm->mmap_lock){++++}-{4:4}, at: dump_user_range+0x187/0xb30 fs/coredump.c:941
 #2: ffff88807a754148 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:922 [inline]
 #2: ffff88807a754148 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_fault+0x625/0x2740 mm/filemap.c:3410
3 locks held by syz.0.3226/20989:
 #0: ffff888060ed4420 (sb_writers#5){.+.+}-{0:0}, at: get_signal+0x22e3/0x26d0 kernel/signal.c:3019
 #1: ffff888012859fe0 (&mm->mmap_lock){++++}-{4:4}, at: mmap_read_lock_killable include/linux/mmap_lock.h:193 [inline]
 #1: ffff888012859fe0 (&mm->mmap_lock){++++}-{4:4}, at: dump_user_range+0x187/0xb30 fs/coredump.c:941
 #2: ffff88807a754148 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_invalidate_lock_shared include/linux/fs.h:922 [inline]
 #2: ffff88807a754148 (mapping.invalidate_lock){++++}-{4:4}, at: filemap_fault+0x2d8/0x2740 mm/filemap.c:3391
3 locks held by syz.3.3263/21154:
 #0: ffff888067fae588 (vm_lock){++++}-{0:0}, at: do_user_addr_fault+0x452/0x1370 arch/x86/mm/fault.c:1328
 #1: ffff88814e826518 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x171/0x380 mm/memory.c:3287
 #2: ffff88814e82a950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x5e4/0x1410 fs/jbd2/transaction.c:444
3 locks held by syz.1.3264/21158:
 #0: ffff888065337588 (vm_lock){++++}-{0:0}, at: do_user_addr_fault+0x452/0x1370 arch/x86/mm/fault.c:1328
 #1: ffff88814e826518 (sb_pagefaults){.+.+}-{0:0}, at: do_page_mkwrite+0x171/0x380 mm/memory.c:3287
 #2: ffff88814e82a950 (jbd2_handle){++++}-{0:0}, at: start_this_handle+0x5e4/0x1410 fs/jbd2/transaction.c:444

=============================================

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 32 Comm: khungtaskd Not tainted 6.15.0-rc3-syzkaller-00019-gbc3372351d0c #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x27b/0x390 lib/nmi_backtrace.c:113
 nmi_trigger_cpumask_backtrace+0x29c/0x300 lib/nmi_backtrace.c:62
 trigger_all_cpu_backtrace include/linux/nmi.h:158 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:274 [inline]
 watchdog+0xf70/0x12c0 kernel/hung_task.c:437
 kthread+0x3c2/0x780 kernel/kthread.c:464
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 11185 Comm: kworker/u8:27 Not tainted 6.15.0-rc3-syzkaller-00019-gbc3372351d0c #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025
Workqueue: events_unbound nsim_dev_trap_report_work
RIP: 0010:on_stack arch/x86/include/asm/stacktrace.h:59 [inline]
RIP: 0010:unwind_next_frame+0x1683/0x20a0 arch/x86/kernel/unwind_orc.c:665
Code: 80 3c 02 00 0f 85 01 05 00 00 49 8b 45 10 48 39 dd 0f 87 00 f8 ff ff 48 39 d8 0f 86 f7 f7 ff ff 48 8d 53 08 48 39 d0 0f 93 c1 <48> 39 d5 0f 92 c0 84 c1 0f 84 df f7 ff ff 48 39 5c 24 10 0f 82 d4
RSP: 0018:ffffc9000bcd7648 EFLAGS: 00000202
RAX: ffffc9000bcd8000 RBX: ffffc9000bcd7e88 RCX: ffffc9000bcd8001
RDX: ffffc9000bcd7e90 RSI: ffffc9000bcd7e58 RDI: ffffc9000bcd76c8
RBP: ffffc9000bcd0000 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000004 R11: 0000000000008329 R12: ffffc9000bcd7708
R13: ffffc9000bcd76b8 R14: ffffc9000bcd7e88 R15: ffffc9000bcd76ec
FS:  0000000000000000(0000) GS:ffff888124abf000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00005575c7738680 CR3: 000000000e180000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 arch_stack_walk+0x94/0x100 arch/x86/kernel/stacktrace.c:25
 stack_trace_save+0x8e/0xc0 kernel/stacktrace.c:122
 kasan_save_stack+0x33/0x60 mm/kasan/common.c:47
 kasan_save_track+0x14/0x30 mm/kasan/common.c:68
 poison_kmalloc_redzone mm/kasan/common.c:377 [inline]
 __kasan_kmalloc+0xaa/0xb0 mm/kasan/common.c:394
 kasan_kmalloc include/linux/kasan.h:260 [inline]
 __do_kmalloc_node mm/slub.c:4341 [inline]
 __kmalloc_node_track_caller_noprof+0x221/0x510 mm/slub.c:4360
 kmalloc_reserve+0xef/0x2c0 net/core/skbuff.c:599
 __alloc_skb+0x166/0x380 net/core/skbuff.c:668
 alloc_skb include/linux/skbuff.h:1340 [inline]
 nsim_dev_trap_skb_build drivers/net/netdevsim/dev.c:748 [inline]
 nsim_dev_trap_report drivers/net/netdevsim/dev.c:805 [inline]
 nsim_dev_trap_report_work+0x2b1/0xcf0 drivers/net/netdevsim/dev.c:851
 process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3238
 process_scheduled_works kernel/workqueue.c:3319 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
 kthread+0x3c2/0x780 kernel/kthread.c:464
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>